# Understanding Sampling Distribution with Plainmath

Recent questions in Sampling distributions
Paloma Houston 2023-04-01

## Use the row of numbers shown below to generate 12 random numbers between 01 and 9978038 18022 84755 23146 12720 70910 49732 79606Starting at the beginning of the row, what are the first 12 numbers between 01 and 99 in the sample?

College StatisticsOpen question
mekashaw arega2022-11-23

## 1.      Twenty plants werer randomly selected from a normal population of palm trees to measure their height. the sample mean of the height was found to be 5 ma.      Check if there is any significant difference between the sample mean and a  population mean of 6 m with standard deviation of 2 mb.      Below is a plant of residuals versus fits after a straight –line model was used on data for y= sale price of home and X = square foot area of home

celesteh12 2022-10-13

## A population of values has a normal distribution with μ=211.7$\mu =211.7$ and σ=23.8$\sigma =23.8$. You intend to draw a random sample of size n=232$n=232$. Please answer the following questions, and show your answers to 1 decimal place.Find the value separating the bottom 30% values from the top 70% values. Find the sample mean separating the bottom 30% sample means from the top 70% sample means.

College StatisticsOpen question
Lily Caroline2022-10-10

## P(X>2.8) =

Rylie Scarbrough2022-09-13

## The geyser Old Faithful in Yellowstone National Park alternates periods of eruption, which typically last from 1.5 to 4 minutes, with periods of dormancy, which are considerably longer. The following table presents the durations, in minutes,30 of dormancy periods that occurred during a recent year.Construct a frequency distribution using a class width of 7, and using 55 as the lower class limit for the first class.

Shivanisatale710 2022-08-08

## For a distribution with mean 100 and standard deviation 20, a Z-score of 4.5 corresponds to a value

Kofi Asiedu2022-07-31

## Find the area under the standard normal distribution by shading the direction of the following z- scores 1. To the left of z=2.2462. To the right of z=2.10Between z=1.50 and z=2.25

elaine usurfacion2022-07-06

## 1  1/2 + 1  1/2 =

Amahle Sizakele2022-06-15

## Suppose that a random sample of 50 bottles of a particular brand of cough medicine is selected and the alcohol content of each bottle measured. The sample mean alcohol content is 8.6 ml and the standard deviation is 2.99 ml. The standard deviation of the alcohol content is required, by law, to be less than 2.8 ml.A 90% confidence interval for the population variance of the alcohol content is( 6.60 ; 12.91 ).Thus, we can conclude with 90% confidence, that

Nishi Patel2022-06-14

## A retail store has recently started paying attention to customer analytics. The store collected data from a sample of 139 walk-in customers about registration in the store's points program, purchase level, and payment method.

College StatisticsOpen question
Preston Brooks2022-06-11

## The amount of pollutants that are found in waterways near large cities is normally distributed with mean 8.6 ppm and standard deviation 1.4 ppm. 17 randomly selected large cities are studied. Round all answers to 4 decimal places where possible.What is the distribution of X$X$? X$X$ ~ N(,)What is the distribution of ¯x$\overline{x}$? ¯x$\overline{x}$ ~ N(,)What is the probability that one randomly selected city's waterway will have more than 8.8 ppm pollutants? For the 17 cities, find the probability that the average amount of pollutants is more than 8.8 ppm. For part d), is the assumption that the distribution is normal necessary? YesNoFind the IQR for the average of 17 cities.Q1 =  ppmQ3 =  ppmIQR:  ppm

john baptist2022-05-30

## According to the empirical rule, about 95% of the data lies within 2 standard deviations from the mean.True or False?

College StatisticsOpen question
Wala kang Jowa2022-05-25
College StatisticsOpen question
Nasrin Jama2022-05-24

College StatisticsOpen question
Belle Park2022-05-20
College StatisticsOpen question