A study of seat belt users and nonusers yielded the randomly selected sample data summarized in the given table.

Number of cigarettes smoked per day

01-1415 and over

Wear seat belts1843048

Don't wear seat belts1562557

At the 0.01 significance level, test the claim that the amount of smoking is independent of seat belt use. Which of the following is true?

Select one:

a.The expected value of the test statistics is 7.76 and the critical value is 5.99, hence we conclude that the amount of smoking is dependent on seat belt use

b.None of the other answers in necessary true.

c.The expected value of the test statistics is 20.12 and the critical value is 5.99, hence we conclude that the amount of smoking is dependent on seat belt use

d.The expected value of the test statistics is 20.12 and the critical value is 9.21, hence we conclude that the amount of smoking is dependent on seat belt use

e.The expected value of the test statistics is 7.76 and the critical value is 9.21, hence we conclude that the amount of smoking is independent of seat belt use

f.The expected value of the test statistics is 20.12 and the critical value is 4.60, hence we conclude that the amount of smoking is dependent on seat belt use

The values of 2 variables x and y are given as below.

x150125130125140110125125

y6510011010178125100105

The linear correlation coefficient between x and y is

Select one:

a.-0.958

b.None of the other answers in necessary true.

c.-0.949

d.0.949

e.0.958

The world's smallest mammal is the bumblebee bat, also known as the Kitti's hog-nosed bat (or Craseonycteris thonglongyai). Such bats are roughly the size of a large bumblebee. A random sample of 16 bumblebee bats has a mean of 1.71 g and a standard deviation of 0.26 g. Assume that bumblebee bats come from the population of which weights are normally distributed. Test the claim that the mean weight of these bats is more than 1.6 g use a 2% significance level. The test statistics and the critical value are

Select one:

a.1.69 and 2.25 respectively

b.2.25 and 1.69 respectively

c.1.69 and 2.60 respectively

d.None of the other answers in necessary true.

e.2.60 and 1.69 respectively

In a study of the length of time that students require to earn bachelor's degrees, 100 students are randomly selected and they are found to have a mean of 4.5 years and a standard deviation of 1.8 years. Construct a 90% confidence interval estimate of the population mean.

Select one:

a.(4.31, 4.69)

b.(3.86, 5.14)

c.(4.20, 4.80)

d.None of other answer is necessary true.

e.(4.01, 4.99)

The amounts of time (minutes) waited at an LRT train station in Edmonton of 9 people are as follow: 8, 5, 2.5, 2, 2, 2.5, 1.5, 1. The median of this sample data is?

Select one:

a.2.5

b.5.25

c.2.5

d.1.5

e.None of other answers is necessary true.

Which one is of ratio level of measurement?

Select one:

a.Social insurance numbers (SIN).

b.the populations of the cities in Alberta.

c.Letter grades of students in the course MAT 151 in Winter 2021.

d.consumer rating of a product on Amazon: one star, two stars, three stars, four stars, five stars.

e.None of other answers is necessary true.