Question

A coach wants to see how long the members of the swim team can hold their breath. He times each member and finds that the average is 48 seconds. What type of study is this

Answer 1

Experiment should be right

Answer 2

these are the answers they gave me


Double-blind study

Experiment

Observational study

Randomized trial

Answer 3

Experiment is the right answer

Answer 4

The length of a screw produced by a machine is normally distributed with a mean of 0.55 inches and a standard deviation of 0.01 inches. What percent of screws are between 0.53 and 0.57 inches?

Answer 5

do you know how to do this one to ?

Answer 6

95%

Answer 7

A study of five hundred adults found that the number of hours they spend on social networking sites each week is normally distributed with a mean of 14 hours. The population standard deviation is 3 hours. What is the margin of error for a 95% confidence interval?

Answer 8

What about this one to

Answer 9

0.26

Answer 10

thank you

Answer 11

A diner asked its customers, "Did you cook dinner last night?" The results on the survey are shown in the table below:

Male Female
Cooked dinner 305 279
Did not cook dinner 152 459
What is the probability that one of the customers chosen from this survey was a female and cooked dinner?

Answer 12

0.25

Answer 13

A Venn diagram is shown below:

a venn diagram showing two categories, A and B. In the A only circle is 1 and 2, in the B circle is 5 and 6, in the intersection is 3 and 4, and in outside the circles is U
What are the elements of (A ∩ B) ' ?

Answer 14

im not sure about this one, sorry