8) The distribution of weekly salaries at a large company is unknown with a mean of $1000 and a standard deviati$370. What is the probability that the sampling error made in estimating the mean weekly salary for all employethe company by the mean of a random sample of weekly salaries of 80 employees will be at most $75?

The distribution of weekly salaries at a large company is unknown with a mean of $1000 and a…

Answered: 8) The distribution of weekly salaries…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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What proportion of the distribution of sample means is greater than a z of -1
Suppose that a study of elementary school students reports that the main age at which children begin reading is 5.9 years with the standard deviation of 0.8 years. If a sampling distribution is created using samples of the ages at which 68 children began reading, what would be the mean of the sampling distribution of sample mean? Round to 2 decimal places, if necessary
Imagine a database from the Gallogly College of Engineering that contained the starting salaries for a sample of Spring 2018 graduating engineers. Recreate the following table and fill out at the intersections what happens to each of the sample statistics when every salary is altered by the specified amount. Change in Mean Median Standard deviation Due to an increase in every salary by $1000 5%
Phyllis, a college business student wants to study how many students in her class study for less than 20 hours per week. Past data reveals that the hours college students study per week has a mean of 29 with standard deviation 9 hours. The normal distribution for the population is shown by the dotted black line. She plans to take a random sample of 36 such college students and will calculate the mean hours studying to compare to the known hours studying. Compute the the mean and standard deviation of the sampling distribution of sample means for a sample of size 36. Round your answers to the nearest tenth. Show your answer by moving the two draggable points to build the sampling distribution.
Suppose that we have a random sample of 8 students with final exam scores: 43, 55, 96, 33, 37, 78, 62 and 20. Find the point estimate of the population proportion by taking into account the values higher than 60
Phyllis, a college business student wants to study how many students in her class study for less than 20 hours per week. Past data reveals that the hours college students study per week has a mean of 29 with standard deviation 9 hours. The normal distribution for the population is shown by the dotted black line. She plans to take a random sample of 36 such college students and will calculate the mean hours studying to compare to the known hours studying. Compute the the mean and standard deviation of the sampling distribution of sample means for a sample of size 36. Round your answers to the nearest tenth. Show your answer by moving the two draggable points to build the sampling distribution.
7.
29. In analysis of variance, an MS value is a measure of a. Variance b. the overall mean for the set of N scores c. the total variability for the set of N scores d. average differences among means
Suppose that a study of elementary school students reports that the mean age at which children begin reading is 5.3 years with a standard deviation of 0.7 years. If a sampling distribution is created using samples of the ages at which 31 children begin reading, what would be the standard deviation of the sampling distribution of sample means?? Round to 2 decimal places if necessary.
Suppose I want to sample the household incomes for EBR parish. Let's say I start with a simple random sample of 100 residents and calculate the sample mean. How would the sampling distribution of change if I increase the sample size to 1,000 residents?
10. A random sample of nine telephone calls in an office provided the following information. Duration Call Number (In Minutes) Туре of Call 1 local 8 long distance 3 4 local 4 3 local 5 5 long distance local 3 local 8 5 local 8 local (a) Determine the point estimate for the average duration of all calls. (b) Determine the standard error of the mean. (c) What is the point estimate for the proportion of all calls that were long distance? (d) Determine the standard error of the proportion. 3. 6 7

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