Recent questions tagged estimate

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How do I estimate treatment effects that vary over groups and time using heterogeneous DID?

asked Jul 5 in Data Science & Statistics by ♦Acalytica Platinum (97.7k points) | 54 views

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How do I estimate treatment effects that vary over groups and time using heterogeneous DID?

asked Jul 5 in Mathematics by ♦Acalytica Platinum (97.7k points) | 70 views

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Why do we sometimes have to estimate or approximate answers in math?

asked Jan 7 in Mathematics by ♦Acalytica Platinum (97.7k points) | 227 views

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The standard error is the

asked Dec 24, 2022 in Data Science & Statistics by ♦Acalytica Platinum (97.7k points) | 170 views

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The interval estimate of the mean value of $y$ for a given value of $x$ is

asked Dec 24, 2022 in Data Science & Statistics by ♦Acalytica Platinum (97.7k points) | 294 views

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In regression analysis, the unbiased estimate of the variance is

asked Dec 24, 2022 in Data Science & Statistics by ♦Acalytica Platinum (97.7k points) | 198 views

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Fisher's Iris dataset contains, among other things, measurements of Petal.Length and Sepal.Length for samples from each of three species of iris. Suppose we want to fit the model

asked Dec 24, 2022 in Data Science & Statistics by ♦Acalytica Platinum (97.7k points) | 163 views

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Without using a calculator, estimate the square root of thirty $\sqrt{30}$

asked Sep 7, 2022 in Mathematics by ♦AstraNova Diamond (55.3k points) | 158 views

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What is the formula for Standard error of estimate (SE)?

asked Aug 20, 2022 in Data Science & Statistics by ♦AstraNova Diamond (55.3k points) | 251 views

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If \[ I(x)= \begin{cases}0 & (x \leq 0) \\ 1 & (x>0)\end{cases} \]

asked Jul 5, 2022 in Mathematics by ♦AstraNova Diamond (55.3k points) | 137 views

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Given: $4-2 x<16$ where $x \in \mathbb{Z}$

asked Jun 22, 2022 in Mathematics by ♦Acalytica Platinum (97.7k points) | 146 views

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Use Newton's Method to determine $x_{2}$ for the given function and given value of $x_{0}$.

asked Feb 1, 2022 in Mathematics by ♦Acalytica Platinum (97.7k points) | 339 views

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Suppose that \[ f(x)= \begin{cases}e^{-1 / x^{2}} & \text { if } x \neq 0 \\ 0 & \text { if } x=0\end{cases} \]

asked Feb 1, 2022 in Mathematics by ♦Acalytica Platinum (97.7k points) | 220 views

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Prove that $\ln x \leq x-1$ for $x>0$

asked Jan 8, 2022 in Mathematics by ♦Acalytica Platinum (97.7k points) | 232 views

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How do you estimate the bias of a coin?

asked Dec 15, 2021 in Data Science & Statistics by ♦Acalytica Platinum (97.7k points) | 278 views

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'Given that the future is unknown, the best we can do is to estimate the likelihood of future events and then use expected profit as the decision criterion.' Discuss.

asked Nov 16, 2021 in General Knowledge by ♦Acalytica Platinum (97.7k points) | 646 views

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Let $X$ be a continuous random variable with p.d.f: \[ f(x)= \begin{cases}a x, & 0<x \leq 1 \\ a, & 1 \leq x \leq 2 \\ -a x+3 a, & 2 \leq x \leq 3 \\ 0, & \text { otherwise }\end{cases} \]

asked Oct 16, 2021 in Data Science & Statistics by ♦Acalytica Platinum (97.7k points) | 368 views

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Which of these is the smallest approximate sample size required to obtain the desired margin of error?

asked Sep 14, 2021 in Data Science & Statistics by ♦Acalytica Platinum (97.7k points) | 310 views

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Use Newton's Method to determine $x_{2}$ for the given function and given value of $x_{0}$.$f(x)=x^{3}-7 x^{2}+8 x-3, x_{0}=5$

asked Aug 17, 2021 in Mathematics by Siyavula Wooden Status (4.2k points) | 335 views

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If $\mathrm{A}=\left[(\mathrm{x}, \mathrm{y}): \mathrm{x}^{2}+\mathrm{y}^{2}=25\right]$ and $\mathrm{B}=\left[(\mathrm{x}, \mathrm{y}): \mathrm{x}^{2}+9 \mathrm{y}^{2}=144\right]$, then $\mathrm{A} \cap \mathrm{B}$ contains $\mathrm{points}$.

asked Aug 7, 2021 in Mathematics by ♦Acalytica Platinum (97.7k points) | 236 views

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What property of real numbers would simplify the following expression: $4+7(x-1) ?$

asked Jul 29, 2021 in Mathematics by ♦Acalytica Platinum (97.7k points) | 280 views

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Simplify the following algebraic expression: $\frac{16 x^{2}}{4 x}-\frac{21 x^{3} y^{2}}{7 x^{2} y^{2}}$

asked Jun 17, 2021 in Mathematics by ♦Maths Genie Bronze Status (8.8k points) | 177 views

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A human resource manager is trying to estimate the cost of a workforce accident.

asked Jun 17, 2021 in Mathematics by ♦Maths Genie Bronze Status (8.8k points) | 286 views

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Simplify $9 x+3 y-\frac{7}{2} x+4 y$

asked Jun 17, 2021 in Mathematics by ♦Maths Genie Bronze Status (8.8k points) | 224 views

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Simplify the following surds

asked Jun 14, 2021 in Mathematics by Student Bronze Status (5.7k points) | 249 views

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What new ideas about mathematics have you learnt recently?

asked Jun 14, 2021 in Mathematics by ♦Acalytica Platinum (97.7k points) | 202 views

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Carry out a test of significance for $H_{0}: \mu=40 \mathrm{hrs}$ vs $H_{1} \mu>40 \mathrm{hrs} . \alpha=0.05$

asked Jun 14, 2021 in Data Science & Statistics by ♦Acalytica Platinum (97.7k points) | 245 views

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Find the density that will maximize the hourly flow.

asked Jun 11, 2021 in Mathematics by ♦Acalytica Platinum (97.7k points) | 223 views

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If $|z+4| \leq 3$ then the maximum value of $|z+1|$ is

asked Jun 9, 2021 in Mathematics by ♦Acalytica Platinum (97.7k points) | 369 views

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If $z=x-i y$ and $z^{\frac{1}{3}}=p+i q$, then $\frac{\left(\frac{x}{p}+\frac{y}{q}\right)}{\left(p^{2}+q^{2}\right)}$ is equal to

asked Jun 9, 2021 in Mathematics by ♦Acalytica Platinum (97.7k points) | 384 views

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If $\left(\frac{1+i}{1-i}\right)^{x}=1$, then

asked Jun 9, 2021 in Mathematics by ♦Acalytica Platinum (97.7k points) | 222 views

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Let $f(x)=(x+1)^{2}-1, x \geq-1$

asked Jun 9, 2021 in Mathematics by ♦Acalytica Platinum (97.7k points) | 227 views

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What is the minimum value that the expression $$ \frac{x^{2} y^{2}-2 x^{2} y+2 x^{2}+2 x y-2 x+1}{x^{2} y+x} $$ where $x, y \in \mathbb{R}^{+}$, can attain?

asked May 31, 2021 in Mathematics by ♦AstraNova Diamond (55.3k points) | 246 views

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For $x, y, z \in \mathbb{R}^{+}$ prove that $x^{2}+y^{2}+z^{2} \geq x \sqrt{y^{2}+z^{2}}+y \sqrt{x^{2}+z^{2}}$.

asked May 31, 2021 in Mathematics by ♦Acalytica Platinum (97.7k points) | 373 views

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Harley surveyed his classmates about how many siblings they have and got the following data: $0,1,3,5,4,2,2,9,1,2,0,1,1,1,1,3$ Which measure is best measure of center of the data?

asked May 31, 2021 in Data Science & Statistics by ♦Acalytica Platinum (97.7k points) | 428 views

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Suppose $X$ is $\mathrm{N}\left(\mu, \sigma^{2}\right)$. For $a=1,2,3$ find $P(|X-\mu|<a \sigma)$.

asked May 30, 2021 in Data Science & Statistics by ♦Acalytica Platinum (97.7k points) | 356 views

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Suppose $X$ is $\mathrm{N}(-1,4)$. Find

asked May 30, 2021 in Data Science & Statistics by ♦Acalytica Platinum (97.7k points) | 258 views

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Suppose $X$ is $\mathrm{N}(10,1) .$ Find (i) $P[X>10.5]$, (ii) $P[9.5<X<11]$, (iii) $x$ such that $P[X<x]=0.95$.

asked May 30, 2021 in Data Science & Statistics by ♦Acalytica Platinum (97.7k points) | 395 views

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Let the random variable $X$ have the density $f(x)=k x$ if $0 \leq x \leq 3$. Find $k$. Find $x_{1}$ and $x_{2}$ such that $P\left(X \leq x_{1}\right)=0.1$ and $P\left(X \leq x_{2}\right)=0.95 .$ Find $P(|X-1.8|<0.6)$.

asked May 30, 2021 in Data Science & Statistics by ♦Acalytica Platinum (97.7k points) | 457 views

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Let $X$ have the density $f(x)=2 x$ if $0 \leq x \leq 1$ and $f(x)=0$ otherwise. Show that $X$ has the mean $2 / 3$ and the variance $1 / 18$. Find the mean and the variance of the random variable $Y=-2 X+3$.

asked May 30, 2021 in Data Science & Statistics by ♦Acalytica Platinum (97.7k points) | 432 views

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What is the area of the portion of the surface $z=x^{2}+y^{2}$ lying inside the cylinder $x^{2}+y^{2}=4$ in $x y z$ -space?

asked May 30, 2021 in Mathematics by ♦Acalytica Platinum (97.7k points) | 316 views

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How do you form numerals from digits?

asked May 24, 2021 in Mathematics by ♦AstraNova Diamond (55.3k points) | 276 views

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In a presidential election, there are four candidates. Call them $\mathrm{A}, \mathrm{B}, \mathrm{C}$, and $\mathrm{D}$.

asked May 22, 2021 in Data Science & Statistics by ♦AstraNova Diamond (55.3k points) | 1.1k views

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Let $f(z)$ be the principal branch of $\sqrt[3]{z}$.

asked May 10, 2021 in Mathematics by ♦AstraNova Diamond (55.3k points) | 585 views

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Show that $$ |\cos (z)|^{2}=(\cos x)^{2}+(\sinh y)^{2} $$ for all $z \in \mathbb{C}$, where $x=\operatorname{Re}(z)$ and $y=\operatorname{Im}(z)$

asked May 10, 2021 in Mathematics by ♦AstraNova Diamond (55.3k points) | 1.1k views

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Show that $$ |\sin z|^{2}=(\sin x)^{2}+(\sinh y)^{2} $$ for all complex numbers $z=x+y i$.

asked May 10, 2021 in Mathematics by ♦AstraNova Diamond (55.3k points) | 1.8k views

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Show that $$ |\log (z)| \leq|\ln | z||+\pi $$ for all $z \neq 0$

asked May 10, 2021 in Mathematics by ♦AstraNova Diamond (55.3k points) | 332 views

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Show that $$ \frac{R^{4}-R}{R^{2}+R+1} \leq\left|\frac{z^{4}+i z}{z^{2}+z+1}\right| \leq \frac{R^{4}+R}{(R-1)^{2}} $$ for all $z$ satisfying $|z|=R>1$.

asked May 10, 2021 in Mathematics by ♦AstraNova Diamond (55.3k points) | 354 views

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Determine the best value of $h$ for the greatest accuracy of the answer. How many digits accuracy can you expect with this choice of $h ?$

asked May 9, 2021 in Mathematics by ♦Acalytica Platinum (97.7k points) | 370 views

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Show that for any $n$, there is a $z \in[a, b]$ such that $z$ has period $n$ under $f$.

asked May 9, 2021 in Mathematics by ♦Acalytica Platinum (97.7k points) | 308 views

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