Please answer these five question for a timed quiz will end in 25 min

(1)

In the ICU Admissions dataset, one of the variables Is HeartRate.

HeartRate: Pulse rate (beats per minute)

Using StatKey simulation methods, find a 90% confidence interval for the standard deviation of the HeartRate in the population represented by this sample. Compute the length of the interval and choose the closest value to it from these choices.

4.1

5.4

6.1

6.7

7.4

(2)

In the ICU Admissions dataset, two of the variables are:

Age: Subject's Age (in years)

Sex: 0 = male or 1 = female

Using StatKey simulation methods, test the claim that the average age of females is higher than the average age of males, in the population represented by this sample. Find the p-value and choose the closest value to it from these choices.

0.01

0.03

0.05

0.07

0.09

0.11

(3)

In the ICU Admissions dataset, the "coding" of the variables includes:

Status: Patient status: 0 = lived or 1 = died

Sex: 0 = male or 1 = female

Of all the females in this study, what proportion died? Give the proportion as a decimal between 0 and 1, using 3 decimal places.

(4)

A study was done with randomly assigned infant mice to be given antibiotics or not. After the mice were adults, their weights were recorded and rated in a way that classified them as obese or not. The conclusion of the study was that the mice given antibiotics were more likely to be obese as adults. Can this study be used as evidence of causality?

Yes

No

(5)

A study was done with humans where it was found that children who were given antibiotics before they were one year old (for example, for ear infections) were more likely to be obese as adults than children who were not given antibiotics before they were one year old. Can this study be used as evidence of causality?

Yes

No