Question

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 79 91 88 78 56 101 61 86 71 87 81 83 57 80 75 102 61 Past 88 89 93 94 64 84 86 92 88 91 90 91 Let ?1 be the recent times and let ?2 be the past times. What are the null and alternative hypotheses? A. H0: ?1 = ?2 H1: ?1 ? ?2 B. H0: ?1 ? ?2 H1: ?1 = ?2 C. H0: ?1 = ?2 H1: ?1 > ?2 D. H0: ?1 < ?2 H1: ?1 = ?2 Calculate the test statistic. t = (Round to two decimal places as needed.) Find the P-value. P-value = (Round to three decimal places as needed.) Make a conclusion about the null hypothesis and a final conclusion that addresses the original claim. Use a significance level of 0.10. H0 because the P-value is the significance level. There sufficient evidence that the mean time interval has changed. Is the conclusion affected by whether the significance level is 0.10 or 0.01? 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. 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. C. 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. D. 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.

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 79 91 88 78 56 101 61 86 71 87 81 83 57 80 75 102 61
Past 88 89 93 94 64 84 86 92 88 91 90 91

Let ?1 be the recent times and let ?2 be the past times. What are the null and alternative hypotheses?

A. H0: ?1 = ?2
H1: ?1 ? ?2
B. H0: ?1 ? ?2
H1: ?1 = ?2
C. H0: ?1 = ?2
H1: ?1 > ?2
D. H0: ?1 < ?2
H1: ?1 = ?2

Calculate the test statistic.
t = (Round to two decimal places as needed.)

Find the P-value.
P-value = (Round to three decimal places as needed.)

Make a conclusion about the null hypothesis and a final conclusion that addresses the original claim. Use a significance level of 0.10.

H0 because the P-value is the significance level. There sufficient evidence that the mean time interval has changed.

Is the conclusion affected by whether the significance level is 0.10 or 0.01?

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. 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.
C. 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.
D. 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.

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 79 91 88 78 56 101 61 86 71 87 81 83 57 80 75 102 61
Past 88 89 93 94 64 84 86 92 88 91 90 91

Let ?1 be the recent times and let ?2 be the past times. What are the null and alternative hypotheses?

A. H0: ?1 = ?2
H1: ?1 ? ?2
B. H0: ?1 ? ?2
H1: ?1 = ?2
C. H0: ?1 = ?2
H1: ?1 > ?2
D. H0: ?1 < ?2
H1: ?1 = ?2

Calculate the test statistic.
t = (Round to two decimal places as needed.)

Find the P-value.
P-value = (Round to three decimal places as needed.)

Make a conclusion about the null hypothesis and a final conclusion that addresses the original claim. Use a significance level of 0.10.

H0 because the P-value is the significance level. There sufficient evidence that the mean time interval has changed.

Is the conclusion affected by whether the significance level is 0.10 or 0.01?

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. 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.
C. 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.
D. 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.

Added by Curtis S.

Question

Please give Ace some feedback