# statistics help required

**Question description**

You can take 30 minutes

Question 1

- What requirements are necessary for a normal probability distribution to be a
*standard*normal probability distribution?a. The mean is 1 and the standard deviation is 0.

b. The mean is 0 and the standard deviation is 0.

c. The mean is 0 and the standard deviation is 1.

d. The mean is 1 and the standard deviation is 1.

1 points

### Question 2

2 points

### Question 3

2 points

### Question 4

2 points

### Question 5

1 points

### Question 6

1 points

### Question 7

2 points

### Question 8

1 points

### Question 9

- Two high school students took equivalent language tests, one in German and one in French. The student taking the German test, for which the mean was 66 and the standard deviation was 8, scored an 82, while the student taking the French test, for which the mean was 27 and the standard deviation was 5, scored a 35. Use z-scores to compare the scores.
a. A score of 82 with a mean of 66 and a standard deviation of 8 is better.

b. The two scores are statistically the same.

c. You cannot determine which score is better from the given information.

d. A score of 35 with a mean of 27 and a standard deviation of 5 is better.

1 points

### Question 10

2 points

### Question 11

- Assume that blood pressure readings are normally distributed with a mean of 117 and a standard deviation of 5. A researcher wishes to select people for a study but wants to exclude the top 10%. What would be the largest reading that would still qualify the person for the study?
a. 110.6

b. 123.4

c. 122.4

d. 132.9

1 points

### Question 12

2 points

### Question 13

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