Unit Test — Unit test

Question 1

The resting heart rates for 80 women aged 46–55 in a simple random sample are normally distributed, with a mean of 71 beats per minute and a standard deviation of 6 beats per minute. Assuming a 90% confidence level (90% confidence level = z-score of 1.645), what is the margin of error for the population mean?Remember, the margin of error, ME, can be determined using the formula .

Revolt · Accepted Answer

1.10

Question 2

Emi computes the mean and variance for the population data set 87, 46, 90, 78, and 89. She finds the mean is 78. Her steps for finding the variance are shown below.What is the first error she made in computing the variance?

Revolt · Accepted Answer

Emi evaluated (46 - 78)2 as -(32)2.

Question 3

The stem-and-leaf plot below shows the number of pages each student in a class read the previous evening.Which statement is true about the data set?

Revolt · Accepted Answer

The value of the first quartile is 13.

Question 4

Nikhil asked 120 randomly chosen moviegoers to watch a clip of an upcoming movie and choose the best title. The title "Everything” was chosen by 36 of the moviegoers as the preferred title.

Revolt · Accepted Answer

between 23% and 37%

Question 5

The difference between an observational study and an experiment is that

Revolt · Accepted Answer

in an observational study, the researchers do not control treatment, and in an experiment, they do.

Unit Test — Unit test Answers

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