Question

1.Which of the following statements is typically NOT true about the...

1.Which of the following statements is typically NOT true about the null hypothesis? (1 point)

a

It presumes innocence.

b

It is what we are trying to show is false.

c

It has no change; things are as they should be.

d

It focuses on the suspicion of an event

2.There is a new treatment to help smokers stop smoking. In an experiment, 80% of 300 smokers quit after 10 days of treatment. Which of the following is the 95% confidence interval? (1 point)

a

(0.755, 0.845)

b

(0.8096, 0.8904)

c

(0.8048, 0.8952)

d

(0.749, 0.851)

3.Which of the following statements is NOT a possible alternative hypothesis? (1 point)

a

The mean is less than the null hypothesis.

b

The mean is greater than the null hypothesis.

c

The mean is equal to the null hypothesis.

d

The mean is different than the null hypothesis.

4.Your job is to test the number of calories in food. Seventeen samples of the brand-name product have a mean of 158.706 and a sample standard deviation of 25.236, when 17 are tested. Seventeen samples of the generic-name product have a mean of 122.471 and a sample standard deviation of 26.483, when 17 are tested. Which of the following represents the 95% confidence interval for the difference in mean amount of calories?

a

(17.79, 54.67)

b

(18.161, 54.309)

c

(17.01, 55.46)

d

(18.23, 54.24)

5.At a local fast-food restaurant, packages of condiments are placed in a box near the self-serve area. Currently, the box contains 13 ketchup packets, 11 salt packets, 9 honey packets, 14 mustard packets, 10 BBQ sauce packets, and 11 relish packets. If you were to compute goodness of fit, which of the following represents the degree(s) of freedom?

a

1

b

3

c

5

d

6

6.The following table presents data about Magic Marshmallows cereal. Which of the following values belongs in the bottom row of the Rainbows column? (1 point)

a

0.0238

b

0.0909

c

0.111

d

0.403

7.Soda Tak claims Diet Tak has 40 milligrams of sodium per can. You work for a consumer organization that tests such claims. You take a random sample of 60 cans and find the mean amount of sodium in the sample is 42.4 milligrams. The population standard deviation in all cans is 5.2 milligrams. You suspect there is more than 40 milligrams of sodium per can. What is the z-score? (1 point)a

1.785

b

2.582

c

3.575

d

5.143

8.Which of the following statements is NOT true about error types? (1 point)

a

A Type I error is when a true null hypothesis is rejected incorrectly.

b

A Type II error is when a false null hypothesis is rejected.

c

A Type I error is denoted by the Greek letter alpha.

d

A Type II error is denoted by the Greek letter beta.

9.Researchers conducted a survey to examine the difference between the proportion of females who vote and the proportion of males who vote. They found that 85 of 200 males voted whereas 124 of 220 females voted. Which of the following represents the 95% confidence interval for the difference of proportions females - males in this case?

a

(0.225, 0.402)

b

(0.095, 0.282)

c

(0.044, 0.233)

d

(0.050, 0.147)

10.You take a sample (n = 25) of test scores from a population. The sample mean is 38 and the population standard deviation is 6.5. What is the 95% confidence interval of the mean? (1 point)

a

(36.7, 39.3)

b

(35.45, 40.55)

c

(36.04, 39.96)

d

(35.77, 40.23)