Explanation Given info: Assume σ 1 2 ≠ σ 2 2 , x ¯ 1 = $ 0.034 , x ¯ 2 = $ 0.033 , s 1 = $ 0.054 , s 2 = $ 0.052 , α = 0.05 , n 1 = 7 , 133 , and n 2 = 4 , 726 . Calculation: The hypotheses are given below: Null hypothesis: H 0 : μ 1 = μ 2 Alternative hypothesis: H a : μ 1 ≠ μ 2 Test statistic: Software Procedure: Step by step procedure to obtain test statistic using the MINITAB software: Choose Stat > Basic Statistics > 2-Sample t . Choose Summarized data . In first, enter Sample size as 7,133 , Mean as 0.034 , Standard deviation as 0.054 . In second, enter Sample size as 4,726 , Mean as 0.033 , Standard deviation as 0.052 . Choose Options . In Confidence level , enter 95 . In Alternative , select not equal . Click OK in all the dialogue boxes. Output using the MINITAB software is given below: From the MINITAB output, the test statistic is 1.01. Critical value: Here, variances are not equal

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Author: Larson

Publisher: PEARSON EDUCATION (COLLEGE)

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Chapter 8, Problem 5T

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To test: Whether there is a difference in the value of coins found on a street from 1985 through 1996 for the two mint locations or not.

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Chapter 8, Problem 4T

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EKS C ALEKS - Kim Johnson - Ch 6S × 4 www-awy.aleks.com alekscgi/x/sl.exe/16_u-lgNs/kr7j8FB)--BjuvZG weRMign 4tCy83MpSgONH0-ovaPm-Zym e Chrome isn't your default browser Set as default Ch 6 Sec 4 Homework Question 4 of 4 (1 point) | Question Attempt: 2 of Unlimited ✓ 2 ✓ 3 = 4 Stress at work: In a poll conducted by the General Social Survey, 81% of respondents said that their jobs were sometimes or always stressful. Two hundred workers are chosen at random. Use the TI-84 Plus calculator as needed. Round your answer to at least four decimal places. (a) Approximate the probability that 155 or fewer workers find their jobs stressful. (b) Approximate the probability that more than 145 workers find their jobs stressful. (c) Approximate the probability that the number of workers who find their jobs stressful is between 154 and 172 inclusive. Part 1 of 3 The probability that 155 or fewer workers find their jobs stressful is 0.1207 Part 2 of 3 bility that more than 145 workers find their jobs…

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Chapter 8 Solutions

MYLAB STATISTICS: ELEMENTARY STATISTICS

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To test: Whether there is a difference in the value of coins found on a street from 1985 through 1996 for the two mint locations or not.

Solution Summary: The author concludes that there is no difference in the value of coins found on a street from 1985 through 1996 for the two mint locations.

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To test: Whether there is a difference in the value of coins found on a street from 1985 through 1996 for the two mint locations or not.

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Chapter 8 Solutions