2nd Edition

ISBN: 9781259724275

Author: William Navidi, Barry Monk

Publisher: McGraw-Hill Education

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Chapter 9.2, Problem 38E

A test is made of H 0 : μ = 5 versus H 1 : μ < 5 . A sample of size n = 87 is drawn, and x ¯ = 4.5 . The population standard deviation is σ = 25 .

Compute the value of the test statistic z.
Is H 0 rejected at the α = 0.05 level?
Is H 0 rejected at the α = 0.01 level?

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Chapter 9.2, Problem 37E

Chapter 9.2, Problem 39E

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Chapter 9 Solutions

Elementary Statistics 2nd Edition

Ch. 9.1 - In Exercises 17â€“20, determine whether the...Ch. 9.1 - In Exercises 17-20, determine whether the outcome...Ch. 9.1 - In Exercises 17â€“20, determine whether the...Ch. 9.1 - In Exercises 17â€“20, determine whether the...Ch. 9.1 - Fertilizer: A new type of fertilizer is being...Ch. 9.1 - Big fish: A sample of loo flounder of a certain...Ch. 9.1 - Check, please: A restaurant owner claims that the...Ch. 9.1 - Coffee: The mean caffeine content per cup of...Ch. 9.1 - Big dogs: A veterinarian claims that the mean...Ch. 9.1 - Business trips A sales manager believes that the...Ch. 9.1 - Type I error: A company that manufactures steel...Ch. 9.1 - Type I error: Washers used in a certain...Ch. 9.1 - Scales: It is desired to check the calibration of...Ch. 9.1 - IQ: Scores on a certain IQ test are known to have...Ch. 9.2 - In Exercises 23â€“28, fill in each blank with the...Ch. 9.2 - In Exercises 23-28, fill in each blank with the...Ch. 9.2 - Prob. 25E Ch. 9.2 - In Exercises 23-28, fill in each blank with the...Ch. 9.2 - Prob. 27E Ch. 9.2 - Prob. 28E Ch. 9.2 - In Exercises 29-34, determine whether the...Ch. 9.2 - In Exercises 29-34, determine whether the...Ch. 9.2 - Prob. 31E Ch. 9.2 - Prob. 32E Ch. 9.2 - Prob. 33E Ch. 9.2 - Prob. 34E Ch. 9.2 - A test is made of H0:=50 versus H1:50. A sample of...Ch. 9.2 - A test is made of H0:=14 versus H1:14. A sample of...Ch. 9.2 - A test is made of H0:=130 versus H1:130. A sample...Ch. 9.2 - A test is made of H0:=5 versus H1:5. A sample of...Ch. 9.2 - A test of the hypothesis H0:=65 versus H1:65 was...Ch. 9.2 - A test of the hypothesis H0:=150 versus H1:150 was...Ch. 9.2 - True or false: If P=0.02, then The result is...Ch. 9.2 - True or false: If P=0.08, then The result is...Ch. 9.2 - A test of H0:=17 versus H1:17 is performed using a...Ch. 9.2 - A test of H0:=50 versus H1:50 is performed using a...Ch. 9.2 - A test of H0:=0 versus H1:0 is performed using a...Ch. 9.2 - Prob. 46E Ch. 9.2 - If H0 is rejected at the =0.05 level, which of the...Ch. 9.2 - Prob. 48E Ch. 9.2 - If P=0.03, which of the following is the best...Ch. 9.2 - Prob. 50E Ch. 9.2 - Prob. 51E Ch. 9.2 - Are you smarter than a second grader? A random...Ch. 9.2 - Height and age: Are older men shorter than younger...Ch. 9.2 - Calibrating a scale: Making sure that the scales...Ch. 9.2 - Prob. 55E Ch. 9.2 - Prob. 56E Ch. 9.2 - Prob. 57E Ch. 9.2 - Prob. 58E Ch. 9.2 - What are you drinking? Environmental Protection...Ch. 9.2 - Prob. 60E Ch. 9.2 - Interpret calculator display: The age in years was...Ch. 9.2 - Interpret calculator display: The number of...Ch. 9.2 - Prob. 63E Ch. 9.2 - Prob. 64E Ch. 9.2 - Prob. 65E Ch. 9.2 - Statistical or practical significance: A new...Ch. 9.2 - Test scores: A math teacher has developed a new...Ch. 9.2 - Prob. 68E Ch. 9.2 - Prob. 69E Ch. 9.2 - Prob. 70E Ch. 9.2 - Prob. 71E Ch. 9.2 - Large samples and practical significance: A sample...Ch. 9.3 - In Exercises 7 and 8, fill in each blank with the...Ch. 9.3 - Prob. 8E Ch. 9.3 - Prob. 9E Ch. 9.3 - Prob. 10E Ch. 9.3 - Find the P-value for the following values of the...Ch. 9.3 - Find the P-value for the following values of the...Ch. 9.3 - Find the critical value or values for the...Ch. 9.3 - Find the critical value or values for the...Ch. 9.3 - Is there a doctor in the house? The market...Ch. 9.3 - College tuition: The mean annual tuition and fees...Ch. 9.3 - Big babies: The National Health Statistics Reports...Ch. 9.3 - Good credit: The Fair Isaac Corporation (FICO)...Ch. 9.3 - Commuting to work: The American Community Survey...Ch. 9.3 - Watching TV: The General Social Survey asked a...Ch. 9.3 - Prob. 21E Ch. 9.3 - How much is in that can? A machine that fills...Ch. 9.3 - Prob. 23E Ch. 9.3 - Prob. 24E Ch. 9.3 - Keep cool: Following are prices, in dollars, of a...Ch. 9.3 - Prob. 26E Ch. 9.3 - Prob. 27E Ch. 9.3 - Prob. 28E Ch. 9.3 - Interpret calculator display: A sample of adults...Ch. 9.3 - Prob. 30E Ch. 9.3 - Prob. 31E Ch. 9.3 - Prob. 32E Ch. 9.3 - Does this diet work? In a study of the...Ch. 9.3 - Prob. 34E Ch. 9.3 - Prob. 35E Ch. 9.3 - Prob. 36E Ch. 9.3 - Larger or smaller P-value? In a study of sleeping...Ch. 9.3 - Larger or smaller P-value? Juan and Mary want to...Ch. 9.3 - Interpret a P-value: A real estate agent believes...Ch. 9.3 - Interpret a P-value: The manufacturer of a...Ch. 9.3 - Using z instead of t: When the sample size is...Ch. 9.4 - In Exercises 5 and 6, fill in each blank with the...Ch. 9.4 - In Exercises 5 and 6, fill in each blank with the...Ch. 9.4 - Prob. 7E Ch. 9.4 - Prob. 8E Ch. 9.4 - In a simple random sample of size 80, there were...Ch. 9.4 - Prob. 10E Ch. 9.4 - In a simple random sample of size 75, there were...Ch. 9.4 - In a simple random sample of size 150, there were...Ch. 9.4 - Prob. 13E Ch. 9.4 - Prob. 14E Ch. 9.4 - Prob. 15E Ch. 9.4 - Prob. 16E Ch. 9.4 - Quit smoking: In a survey of 444 HIV-positive...Ch. 9.4 - Prob. 18E Ch. 9.4 - Prob. 19E Ch. 9.4 - Curing diabetes: Vertical banded gastroplasty is a...Ch. 9.4 - Tweet tweet: An article in Forbes magazine...Ch. 9.4 - Prob. 22E Ch. 9.4 - Choosing a doctor: Which do patients value more...Ch. 9.4 - Prob. 24E Ch. 9.4 - Interpret calculator display: In a recent poll,...Ch. 9.4 - Prob. 26E Ch. 9.4 - Prob. 27E Ch. 9.4 - Prob. 28E Ch. 9.4 - Prob. 29E Ch. 9.4 - Who will you vote for? A simple random sample of...Ch. 9.4 - Prob. 31E Ch. 9.4 - Dont perform a test: Over the past 100 days, the...Ch. 9.4 - Exact test: When np010 or n(1p0)10, we cannot use...Ch. 9.5 - In Exercises 5 and 6, fill in each blank with the...Ch. 9.5 - Prob. 6E Ch. 9.5 - Prob. 7E Ch. 9.5 - Prob. 8E Ch. 9.5 - Prob. 9E Ch. 9.5 - Prob. 10E Ch. 9.5 - Prob. 11E Ch. 9.5 - Prob. 12E Ch. 9.5 - A random sample of size 25 from a normal...Ch. 9.5 - Prob. 14E Ch. 9.5 - Babies: A sample of 25 one-year-old girls had a...Ch. 9.5 - Watching TV: The General Social Survey asked a...Ch. 9.5 - IQ scores: Scores on an IQ test are normally...Ch. 9.5 - SAT scores: Scores on the math SAT are normally...Ch. 9.5 - How much is in that can? 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True or false:...Ch. 9.7 - Prob. 11E Ch. 9.7 - Prob. 12E Ch. 9.7 - Prob. 13E Ch. 9.7 - Watch sour cholesterol: An article in the...Ch. 9.7 - Prob. 15E Ch. 9.7 - Coffee beans: Refer to Exercise 12. A test of the...Ch. 9.7 - Prob. 17E Ch. 9.7 - Prob. 18E Ch. 9.7 - Prob. 19E Ch. 9 - Fill in the blank: A test of the hypotheses H0:=65...Ch. 9 - A hypothesis test results in a P-value of 0.008....Ch. 9 - Prob. 3CQ Ch. 9 - Prob. 4CQ Ch. 9 - Prob. 5CQ Ch. 9 - Prob. 6CQ Ch. 9 - Prob. 7CQ Ch. 9 - In a random sample of 500 people who took their...Ch. 9 - Prob. 9CQ Ch. 9 - Prob. 10CQ Ch. 9 - Prob. 11CQ Ch. 9 - In a test of H0:=5 versus H1:5, the value of the...Ch. 9 - True or false: We can perform a test for a...Ch. 9 - Prob. 14CQ Ch. 9 - Prob. 15CQ Ch. 9 - Prob. 1RE Ch. 9 - Prob. 2RE Ch. 9 - Prob. 3RE Ch. 9 - Prob. 4RE Ch. 9 - Prob. 5RE Ch. 9 - Prob. 6RE Ch. 9 - Prob. 7RE Ch. 9 - Job satisfaction: The General Social Survey...Ch. 9 - Prob. 9RE Ch. 9 - Prob. 10RE Ch. 9 - Prob. 11RE Ch. 9 - Prob. 12RE Ch. 9 - Prob. 13RE Ch. 9 - Prob. 14RE Ch. 9 - Prob. 15RE Ch. 9 - Prob. 1WAI Ch. 9 - Prob. 2WAI Ch. 9 - Prob. 3WAI Ch. 9 - Prob. 4WAI Ch. 9 - Prob. 5WAI Ch. 9 - Prob. 6WAI Ch. 9 - Prob. 1CS Ch. 9 - Prob. 2CS Ch. 9 - Prob. 3CS Ch. 9 - For some records marked with a * the record...Ch. 9 - Prob. 5CS Ch. 9 - Prob. 6CS Ch. 9 - Prob. 7CS

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A test is made of H 0 : μ = 5 versus H 1 : μ < 5 . A sample of size n = 87 is drawn, and x ¯ = 4.5 . The population standard deviation is σ = 25 . Compute the value of the test statistic z . Is H 0 rejected at the α = 0.05 level? Is H 0 rejected at the α = 0.01 level?

Solution Summary: The author calculates the test statistics using the given data. They conclude that there is insufficient evidence to reject the null hypothesis.

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Chapter 9 Solutions

A test is made of H 0 : μ = 5 versus H 1 : μ &lt; 5 . A sample of size n = 87 is drawn, and x ¯ = 4.5 . The population standard deviation is σ = 25 . Compute the value of the test statistic z . Is H 0 rejected at the α = 0.05 level? Is H 0 rejected at the α = 0.01 level?

Solution Summary: The author calculates the test statistics using the given data. They conclude that there is insufficient evidence to reject the null hypothesis.

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Want to see the full answer?

Chapter 9 Solutions

A test is made of H 0 : μ = 5 versus H 1 : μ < 5 . A sample of size n = 87 is drawn, and x ¯ = 4.5 . The population standard deviation is σ = 25 . Compute the value of the test statistic z . Is H 0 rejected at the α = 0.05 level? Is H 0 rejected at the α = 0.01 level?