You are working as an assistant to the dean of institutional research at your university. The dean wants to survey members of the alumni association who obtained their baccalaureate degrees 5 years ago to learn what their starting salaries were in their first full-time job after receiving their degrees. A sample of 150 alumni is to be randomly selected from the list of 2,100 graduates in that class. If the dean's goal is to construct a 90% confidence interval estimate for the population mean starting salary, why is it not possible that you will be able to use the expression X+ Zo 06- for this purpose? Explain. Why is it not possible to use the equation? A. The population standard deviation a is not known. B. The sample size n is too large to use this expression. C. The sample sizen is not large enough to use this expression. D. The sample mean X might not be a whole number, but the number of students must be.

You are working as an assistant to the dean of institutional research at your university. The dean wants to survey members of the alumni association who obtained their baccalaureate degrees 5 years ago to learn what their starting salaries were in their first full-time job after receiving their degrees. A sample of 150 alumni is to be randomly selected from the list of 2,100 graduates in that class. If the dean's goal is to construct a 90% confidence interval estimate for the population mean starting salary, why is it not possible that you will be able to use the expression X+ Zo 06- for this purpose? Explain. Why is it not possible to use the equation? A. The population standard deviation a is not known. B. The sample size n is too large to use this expression. C. The sample sizen is not large enough to use this expression. D. The sample mean X might not be a whole number, but the number of students must be.

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

See similar textbooks

Similar questions

Out of 500 people sampled, 145 received flu vaccinations this year. Based on this, construct a 90% confidence interval for the true population proportion of people who received flu vaccinations this year.Give your answers as decimals, to three places
The New York Times conducted a nationwide poll of 1048 randomly selected 13- to 17-year-olds. to estimate the proportion of 13- to 17-year-olds who have a television in their room. We can consider the sample to be a simple random sample. Of these 1048 teenagers, 692 had a television in their room. Give a 95% confidence interval for the proportion of all people in this age group who had a TV in their room at the time of the poll, and interpret what your interval means in context. State: Plan: Do: Conclude:
Identify the at-score for a 99% confidence interval if the sample size is 70.
In a study of 150 burglary incidents witnessed by the youngsters, 43% lead those young people develop PTSD. Find the 99% confidence interval of the true proportion of burglary incidents that lead the youngsters to develop PTSD.
A political scientist claims that 38% of first-year college students characterize themselves as being “moderate” or “middle of the road” as far as their political affiliation is concerned. Believing this claimed value is too high, you survey a random sample of 400 first-year college students and find that 120 characterize themselves as being “moderate” or “middle of the road.” Based on this information, what will the test statistic be? Choose the answer below that is closest to what you calculate, and try not to do a lot of rounding until you get to the very end of your calculations. 1. -0.3 2. -1.2 3. -2.6 4. -3.3 5. None of the other answer options are correct because the test statistic should be positive, not negative.
if n = 42, p = 0.6 then construct the 98% confidence interval for the population proportion.
Suppose you compute a 93% confidence interval. What will happen to the confidence interval if you decrease the confidence level to 91%?
A recent survey of 1,000 people found that 90% of Americans support background checks for purchasing guns. Construct a 95 % confidence interval for the population proportion.
You want to estimate the average difference in the number of complaints filed by women at work and the number of complaints filed by men at work. You took an SRS of 7 businesses and collected the following data for number of complaints in a year: men 1 3 2 4 6 3 5 women 8 7 6 3 5 12 15 Create a 90% confidence interval for the average difference in the number of complaints filed by women at work and the number of complaints filed by men at work (in a year). You must do this using table C. If this is a 2 sample interval, be sure to specify who is population 1 and who is population 2. If this is a matched pairs interval, be sure to state the order you subtracted your data. Once you create your interval, give a sentence explaining the meaning of the interval (what the numbers in the interval mean, NOT the meaning of 95%) in context of this problem. Round to any appropriate number of decimals.
A statistics content developer at Aplia wanted to know whether study skills are related to memory quality. She invited student volunteers to perform an online memory task. The students saw a list of 60 words and were then asked to recognize a list of 10 words that were on the original list. Students were also asked to provide their GPAs. Consider the following data set, which was collected from student volunteers in 2009. The table gives the frequency for five intervals of scores on the number of correctly identified words. Use the dropdown menus to complete the table by filling in the missing values for the proportions and percentages. Score Interval f Proportion Percentage 9–10 29 0.19 19% 7–8 53 5–6 50 3–4 22 0.14 14% 1–2 1 0.01 1%
Identify the t score for a 99% confidence interval if the sample size is 35 t=
The dataset "nurses" is a random sample of 1,000 cases from “Health Care Provider Credential Data” from Washington State Open Data Portal. In the sample, there are 418 CNA's and 278 of the CNA's have expired credentials. Use the statistics from the nurses dataset to answer the following question: "With 90% confidence, what percent of all CNA's on Washington State's healthcare provider list are expired?"