STATS:DATA+MODELS-W/DVD
4th Edition
ISBN: 9780321986498
Author: DeVeaux
Publisher: PEARSON
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Chapter 11, Problem 6E
To determine
Comment whether the sample selected by the company is a simple random sample or not.
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Students have asked these similar questions
Test the claim about the population mean μ at the level of significance α. Assume the population is normally distributed.
μ
Claim: <4715; α = 0.05
Sample statistics: x = 4917, s = 5501, n = 54
What are the null and alternative hypotheses?
Ho:
Ha
(Type integers or decimals. Do not round.)
Find the standardized test statistic t.
t = ☐
(Round to two decimal places as needed.)
Find the P-value.
P =
(Round to three decimal places as needed.)
Decide whether to reject or fail to reject the null hypothesis. Choose the correct answer below.
Ho. There
enough evidence at the ☐ % level of significance to
Fail to reject
Reject
....
the claim.
A politician claims that the mean salary for managers in his state is more than the national mean, $85,000. Assume the the population is normally distributed and the population standard deviation is
$8700. The salaries (in dollars) for a random sample of 30 managers in the state are listed. At α = 0.01, is there enough evidence to support the claim? Use technology.
92,421
81,412
85,143
97,220
99,317
71,884
97,762
86,108
98,385
73,869
81,391
95,997
98,828
86,476
77,893
74,995
90,472
81,330
92,183
94,649
77,880
91,821
90,907
84,640
78,479
81,703
89,573
89,948
70,938
81,300
(a) Identify the null hypothesis and alternative hypothesis.
O A. Ho: " =85,000
Нa: μ85,000
D. Hoi u >85,000
Нa: μ≤85,000
(b) Identify the standardized test statistic.
Z=
B. Hoμ≥85,000
Haμ85,000
Haμ≤85,000
(Round the final answer to two places as needed. Round all intermediate values to three places as needed.)
(c) Find the P-value. Use technology.
(Round to three decimal places as needed.)
(d) Decide whether to reject…
I would like to get help to know how to make a report of the multiple regression analysis I performed about 30 employees salaries. it should include a description of the predictice model, pre-analysis, regression analysis, interpretation of the relevant findings and a conclusion with recommendations. thank you
Chapter 11 Solutions
STATS:DATA+MODELS-W/DVD
Ch. 11.2 - 1. Various claims are often made for surveys. Why...Ch. 11.4 - 2. We need to survey a random sample of the 300...Ch. 11 - Prob. 1ECh. 11 - 2. Satisfied workers The managers of a large...Ch. 11 - Prob. 3ECh. 11 - Prob. 4ECh. 11 - Prob. 5ECh. 11 - 6. Sampling satisfaction A company hoping to...Ch. 11 - Prob. 7ECh. 11 - 8. Satisfactory satisfaction samples For each...
Ch. 11 - Prob. 9ECh. 11 - 10. Happy employees The company plans to have the...Ch. 11 - Prob. 11ECh. 11 - 12. Surveying employees The company of Exercise 2...Ch. 11 - Prob. 13ECh. 11 - 14. Student center survey For their class project,...Ch. 11 - Prob. 15ECh. 11 - Prob. 16ECh. 11 - Prob. 17ECh. 11 - Prob. 18ECh. 11 - Prob. 19ECh. 11 - Prob. 20ECh. 11 - Prob. 21ECh. 11 - In Exercises 17 to 23, for the reports about...Ch. 11 - Prob. 23ECh. 11 - 24. Mistaken poll A local TV station conducted a...Ch. 11 - Prob. 25ECh. 11 - 26. Parent opinion, part 1 In a large city school...Ch. 11 - Prob. 27ECh. 11 - 28. Churches For your political science class,...Ch. 11 - 29. Playground Some people have been complaining...Ch. 11 - 30. Roller coasters An amusement park has opened a...Ch. 11 - 31. Playground, act two The survey described in...Ch. 11 - 32. Wording the survey Two members of the PTA...Ch. 11 - 33. Banning ephedra An online poll on a website...Ch. 11 - 34. Survey questions Examine each of the following...Ch. 11 - Prob. 35ECh. 11 - 36. Phone surveys Any time we conduct a survey, we...Ch. 11 - 37. Cell phone survey What about drawing a random...Ch. 11 - 39. Fuel economy Occasionally, when I fill my car...Ch. 11 - 40. Accounting Between quarterly audits, a company...Ch. 11 - 41. Happy workers? A manufacturing company employs...Ch. 11 - 42. Quality control Sammy’s Salsa, a small local...Ch. 11 - 43. A fish story Concerned about reports of...Ch. 11 - 45. Sampling methods Consider each of these...Ch. 11 - 46. More sampling methods Consider each of these...
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- Set up a free RStudio account at posit.cloud. At the start of your R session, you should enter the following commands. set.seed(1) e<-rnorm(n = 100,mean = 0,sd = 80) x<-seq(1,100,1) y<-10+15*x + e Follow the examples in the Panopto Videos to use R to obtain the values requested below. (As always, if you round your answers, make sure you do so correctly and keep at least three decimal places.) (a) The smallest value of y = (b) The largest value of y = (c) The standard deviation of y = (d) The mean of y = (e) The median of y = (f) The correlation between x and y = : (g) Using the variable e as data, the p-value for a test of Hoμ = 0 vs. HA μ0 isarrow_forwardDoes Chi-squared(alpha) always represent the right tail of the the chi-square distribution and does Chi-squared(1-alpha) always represent the left tail of the the chi-square distribution. Also, for a standard normal distribution would Z(1-alpha) be equivalent to -Zalpha in represneting the left tail of the standard normal distribution curve because they both have the same z-score. Furthermore, is my understanding correct in the sense that if we have a critical value,say Zalpha, would the area to the right of it will be alpha and to the left of it would be 1-alphaarrow_forwardOne bulb manufacturer claims an average bulb life of 1,600 hours. It is suspected that the actual average is significantly lower. To verify this, a sample of 49 bulbs is selected and the life of each bulb is measured. A sample mean of 1,500 hours and a standard deviation of 120 hours were obtained from them. Can you be sure, at 5% significance, that the mean life is less than what the manufacturer claims?arrow_forward
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