QUESTION 1 What is the critical value of t for a one tailed test for a sample of

Question

QUESTION 1

What is the critical value of t for a one tailed test for a sample of 25 participants if the alpha is set at .05  

2.357

.677

2.145

1.711

1 points

QUESTION 2

A professor wants to know if her introductory statistics class has a good grasp of basic math at the start of the semester. Six students are chosen at random from the class and given a math proficiency test. The professor wants the class as a whole to be able to score above 70 on the test. The six students get scores of 62, 92, 75, 68, 83, and 95. The professor has 90 percent confidence that the mean score for the class on the test would be above 70?

True

False

1 points

QUESTION 3

What is the critical value of t for a one tailed test for a sample of 10 participants if the alpha is set at .05  

1.711

1.8333

2.021

2.145

1 points

QUESTION 4

The critical value of t-table for a study with 6 participants with alpha set @ .1 one tail is 1.711

True

False

1 points

QUESTION 5

A 90 percent confidence level is equivalent to an alpha level of 0.10

True

False

1 points

QUESTION 6

What is the critical value of t for a two tailed test for a sample of 43 participants if the alpha is set at .05  

2.021

2.145

1.711

2.247

1 points

QUESTION 7

The main reason a research uses a t-test instead of a z-test is when little is known about population (mean and standard deviation).

True

False

1 points

QUESTION 8

Values in the t-table are not actually listed by sample size but by degrees of freedom (df).

True

False

QUESTION 1

Given a frequency distribution of 10,000 scores which has a mean of 120 and a standard deviation of 15, 94.13% of those tested scored 135 or below.

True

False

1 points

QUESTION 2

Given a frequency distribution of 10,000 scores, which approximates the normal curve and has a mean of 120 and a standard deviation of 15, what percentage of those tested scored 135 or below?

15.87%

84.13%

22%

94%

1 points

QUESTION 3

The highway department conducted a study measuring driving speeds on a local section of interstate highway. They found an average speed of 58 miles per hour with a standard deviation of 10. Given this information, what proportion of the cars are traveling between 45 and 70 miles per hour?

.7881 or 78.81%

.3849 or 38.49%

.4043 or 40.32%

.8000 or 80.00%

1 points

QUESTION 4

Given a frequency distribution of 10,000 scores, which approximates the normal curve and has a mean of 120 and a standard deviation of 15, the top 80% had a what raw score or greater?

107.4

106

110

94.34

1 points

QUESTION 5

It is known that IQ scores form a normal distribution with a mu of 100 and a standard deviation of 15. Given this information, what is the probability of randomly selecting an individual with an IQ score less than 120?

Unable to answer this question with information given.

9.72%

90.15%

95%

2 points S

QUESTION 6

The highway department conducted a study measuring driving speeds on a local section of the interstate highway. They found an average speed of mu=58 miles per hour with a standard deviation of 10. Given this information, what proportion of the cards are traveling between 55 and 65 miles per hour?

.3759 or 37.59%

.1179 or 11.79%

.2580 or 25.80%

none of these answers are correct

Explanation / Answer

1. 1.711

2. True

3. 1.833

4. False its 1.47

5. True

6. 2.021

7. False , t test is used when sample size is less than 25

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