Exam 9: Statistical Hypothesis Testing: Hypothesis Tests for a Population Mean
Exam 1: An Introduction to Statistics44 Questions
Exam 2: Descriptive Statistics I: Elementary Data Presentation and Description147 Questions
Exam 3: Descriptive Statistics II: Additional Descriptive Measures and Data Displays128 Questions
Exam 4: Probability147 Questions
Exam 5: Discrete Probability Distributions144 Questions
Exam 6: Continuous Probability Distributions141 Questions
Exam 7: Statistical Inference: Estimating a Population Mean134 Questions
Exam 8: Interval Estimates for Proportions, Mean Differences and Proportion Differences19 Questions
Exam 9: Statistical Hypothesis Testing: Hypothesis Tests for a Population Mean62 Questions
Exam 10: Hypothesis Tests for Proportions, Mean Differences and Proportion Differences39 Questions
Exam 11: Basic Regression Analysis111 Questions
Exam 12: Multiple Regression53 Questions
Exam 13: F Tests and Analysis of Variance95 Questions
Exam 14: Experimental Designonline Only64 Questions
Exam 16: Chi-Square Tests145 Questions
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The average life expectancy of tires produced by the Whitney Tire Company has been 40,000 miles.Management believes that due to a new production process, the life expectancy of its tires has increased.In order to convince others of the validity of management's belief, the correct set of hypotheses is
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(Multiple Choice)
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Correct Answer:
B
You are to test the following hypotheses: H0: µ = 650
Ha: µ ≠ 650
A sample of size 20 produces a sample mean of 672, with a standard deviation of 42.The p-value for this two-tailed test is .0302.If the significance level set for the test is .05, we should
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(Multiple Choice)
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Correct Answer:
B
In hypothesis testing, if the null hypothesis is rejected when the alternative hypothesis is true
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Correct Answer:
D
The competing hypotheses for a hypothesis test are as follows: H0: The earth is flat.
Ha: The earth is round.
Describe what a Type I error and a Type II error would be here.
(Multiple Choice)
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To decide whether to reject a null hypothesis about a population mean, a 95% confidence interval or two-tailed hypothesis test with a significance level of 2.5% could be used.
(True/False)
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The probability of making a Type I error is typically denoted by .
(True/False)
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If a null hypothesis is rejected at a 10% significance level,
(Multiple Choice)
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The p-value is the probability associated with the test statistic while alpha is the probability associated with the critical value.
(True/False)
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You are to test the following hypotheses: H0: µ < 5500
Ha: µ > 5500
A sample of size 100 produces a sample mean of 5560, with a standard deviation of 420.The p-value for this test is
(Multiple Choice)
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A soft drink filling machine, when in perfect adjustment, fills the bottles with 12 ounces of soft drink.Any over-filling or under-filling results in the shutdown and readjustment of the machine.To determine whether the machine is properly adjusted, the most appropriate set of hypotheses is
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If a null hypothesis is rejected at a 1% significance level,
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Whenever the population standard deviation is unknown, which distribution is used in developing a hypothesis test for a population mean?
(Multiple Choice)
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You are to test the following hypotheses: H0: µ = 800
Ha: µ ≠ 800
A sample of size 81 produces a sample mean of 750, with a standard deviation of 216.The p-value for this test is
(Multiple Choice)
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You are to test the following hypotheses: H0: µ = 40
Ha: µ ≠ 40
A sample of size 36 produces a sample mean of 42.2, with a standard deviation of 16.The p-value for this test is
(Multiple Choice)
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You are to test the following hypotheses: H0: µ < 940
Ha: µ > 940
A sample of size 49 produces a sample mean of 994, with a standard deviation of 130.The p-value for this test is
(Multiple Choice)
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The level of significance, is the probability of making a Type II error, which is rejecting a true null hypothesis.
(True/False)
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You are to test the following hypotheses: H0: µ ≥ 1200
Ha: µ < 1200
A sample of size 36 produces a sample mean of 1148, with a standard deviation of 160.The p-value for this test is
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