In a random sample of 23 people, the mean commute time to work was 30.6 minutes and the standard deviation was 7.2 minutes. assume the population is normally distributed and use a t-distribution to construct a 95% confidence interval for the population mean μ. what is the margin of error of muμ? interpret the results.
the confidence interval for the population mean muμ is ( , )
(round to one decimal place as needed.)
the margin of error of μ
(round to one decimal place as needed.)
interpret the results.
a. if a large sample of people are taken approximately 95% of them will have commute times between the bounds of the confidence interval.
b. with 95% confidence, it can be said that the population mean commute time is between the bounds of the confidence interval.
c. with 95% confidence, it can be said that the commute time is between the bounds of the confidence interval.
d. it can be said that 95% of people have a commute time between the bounds of the confidence interval.

Listed below are time intervals (min) between eruptions of a geyser. assume that the "recent" times are within the past few years, the "past" times are from around 20 years ago, and that the two samples are independent simple random samples selected from normally distributed populations. do not assume that the population standard deviations are equal. does it appear that the mean time interval has changed? is the conclusion affected by whether the significance level is 0.10 or 0.01? recent 78 90 90 79 57 101 62 87 71 87 81 84 57 80 74 103 62 past 88 89 93 94 65 85 85 92 87 91 89 91 follow the steps of hypothesis testing, including identifying the alternative and null hypothesis, calculating the test statistic, finding the p-value, and making a conclusions about the null hypothesis and a final conclusion that addresses the original claim. use a significance level of 0.10. is the conclusion affected by whether the significance level is 0.10 or 0.01? answer choices below: a) yes, the conclusion is affected by the significance level because h0 is rejected when the significance level is 0.01 but is not rejected when the significance level is 0.10. b) no, the conclusion is not affected by the significance level because h0 is not rejected regardless of whether a significance level of 0.10 or 0.01 is used. c) yes, the conclusion is affected by the significance level because h0 is rejected when the significance level is 0.10 but is not rejected when the significance level is 0.01. d) no, the conclusion is not affected by the significance level because h0 is rejected regardless of whether a significance level of 0.10 or 0.01 is used.