AutoSave Off Unit 4B Project(2) Search Yup. Another 2-part question. This time we are dealing with 2-samples. A. Officials at Bellevue University hope that changes they have made have improved the retention rate. Last year a sample of 2126 freshmen showed that 1500 returned as sophomores. This year 1512 of 2020 freshmen returned as sophomores. Determine if there is sufficient evidence at the 0.05 level to say that the retention rate has improved. (7 points) B. For the same problem as part A, construct an appropriate confidence interval based on the alpha level in A to support your conclusion from part A. Recall, if you rejected the null in part A, then your expected mean should not be included in the interval. If you failed to reject the null hypothesis, then the hypothesized mean should be in the interval. You should only need the appropriate critical value and margin of error in addition to values from part A. Correctly round your percentage to one decimal place in your conclusion sentence and be sure to state that it supports your decision to reject or fail to reject based on whether the hypothesized value falls in the interval. ( 3 points).

1. AutoSave Off Unit 4B Project(2) Search Yup. Another 2-part question. This time we are dealing
with 2-samples. A. Officials at Bellevue University hope that changes they have made have
improved the retention rate. Last year a sample of 2126 freshmen showed that 1500 returned as
sophomores. This year 1512 of 2020 freshmen returned as sophomores. Determine if there is
sufficient evidence at the 0.05 level to say that the retention rate has improved. (7 points) B. For
the same problem as part A, construct an appropriate confidence interval based on the alpha level
in A to support your conclusion from part A. Recall, if you rejected the null in part A, then your
expected mean should not be included in the interval. If you failed to reject the null hypothesis,
then the hypothesized mean should be in the interval. You should only need the appropriate
critical value and margin of error in addition to values from part A. Correctly round your
percentage to one decimal place in your conclusion sentence and be sure to state that it supports
your decision to reject or fail to reject based on whether the hypothesized value falls in the
interval. ( 3 points)