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Testing Claims About Proportions. In Exercises 9–32, test the given claim. Identify the null hypothesis, alternative hypothesis, test statistic, P-value, or critical value(s), then state the conclusion about the null hypothesis, as well as the final conclusion that addresses the original claim. Use the P-value method unless your instructor specifies otherwise. Use the
15. Survey Return Rate In a study of cell phone use and brain hemispheric dominance, an Internet survey was e-mailed to 5000 subjects randomly selected from an online group involved with ears. 717 surveys were returned. Use a 0.01 significance level to test the claim that the return rate is less than 15%.
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Chapter 8 Solutions
ELEMENTARY STATISTICS
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- Constructing Frequency Distributions. In Exercises 11–18, use the indicated data to construct the frequency distribution. (The data for Exercises 13–16 can be downloaded at TriolaStats.com.) Old Faithful Listed below are sorted duration times (seconds) of eruptions of the Old Faithful geyser in Yellowstone National Park. Use these times to construct a frequency distribution. Use a class width of 25 seconds and begin with a lower class limit of 125 seconds.arrow_forwardSubject; algebraarrow_forward- test the null hypothesis that the population mean, u is 14.arrow_forward
- 2 part Qarrow_forwardAS3. NO3. DATA ANALYSISarrow_forwardAssignment. Read the instruction carefully. (Statistics and Probability 11) B. Write YES if the distribution given is a valid probability distribution for discreterandom variable X; otherwise, write NO. 1. X 0 1 3 4 P (x) 0.22 0.17 0.28 0.33 X 3 4 5 7 P (x) -0.15 -0.27 -0.30 -0.28 3. X 6 8 10 12 P (x) 0.56 0.2 0.2 0.04 4. X 2 3 4 5 P (x) 0.01 0.01 0.1 0.07 5. X 0 1 2 3 P (x) 0.25 0.25 0.25 0.25arrow_forward
- Explain why the t-distribution has less spread as the number of degrees of freedom increases.arrow_forwardStatistics students believe that the mean score on a first statistics test is 65. The instructor thinks that the mean score is higher. She samples 10 statistics students and obtains the scores: Grades 69 69 63.9 68.4 62.7 73.5 73.5 64.3 Test grades are believed to be normally distributed. Use a significance level of 5%. A. State the alternative hypothesis: HA: Ομ 65 B. State the mean of the sample: C. State the standard error of the sample means: D. State the test statistic: t = E. State the p-value: F. Decision: O Fail to reject the null hypothesis. Reject the null hypothesis. 73.5 96arrow_forwardStatistics students believe that the mean score on a first statistics test is 65. The instructor thinks that mean score is higher. She samples 10 statistics students and obtains the scores: Grades 69 68.4 64.3 64.3 73.5 74.4 73.5 88 62.7 85.5 Test grades are believed to be normally distributed. Use a significance level of 5%. A. State the alternative hypothesis: HA: Ομ > 65 OH<65 B. State the mean of the sample: C. State the standard error of the sample means: D. State the test statistic: t = 2.3662 E. State the p-value: 0.0227arrow_forward
- rusharrow_forwardA. Determine whether the distribution represents a probability distribution or not. Explain your answer. 1. 1 7 1 P(X) 4 8. 2. 3 P(X) 3. 1 3 7 0.12 P(X) 4. P(1)=0.42, P(2)-0.31, P(3)=0.37 5. P(1)=, P(2)=35 0.35 0.25 0.22 P(3)=; 6116 8110 4113 116 5-182N116 1/4 1/6arrow_forwardEngineering data analysis show solutionarrow_forward
- Glencoe Algebra 1, Student Edition, 9780079039897...AlgebraISBN:9780079039897Author:CarterPublisher:McGraw Hill