Question 19

1pts

When there is a significant difference in the population, but the research fails to find one ...this is what kind of error?

Group of answer choices

Type I error

Type II Error

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Question 20

1pts

Assume that the average age at which students graduate high school is 17.6. Exum (2002) asked 84 male students at a large Mid-Atlantic University the age at which they had their first alcoholic drink. On average, these 84 students had their first alcoholic drink at 16.54 years of age (standard deviation = 2.03). Perform a hypothesis test to determine if the average person has his/her first alcoholic drink before graduating high school. Use a 0.05 level of statistical significance.

Whichdistribution, z or t,will you use?

Group of answer choices

z-statistic; Standard normal distribution

t-statistic; Student's t distribution

No answer text provided.

No answer text provided.

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Question 21

1pts

Using the table below, how many people are female and have not had their home broken into?

Ever had home broken into?

Gender

Yes

No

Total

Female

1558

1064

2622

Male

1567

1069

2636

Total

3125

2133

5258

Group of answer choices

1558

1064

1567

1069

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Question 22

1pts

Some research suggests that police officers are more likely to make an arrest in the presence of bystanders. If mentally disordered suspects attract more attention from bystanders, they may be more likely to be arrested than nonmentally disordered suspects. Assume that the average number of bystanders when police encounter a suspect is 3.58. In a sample of20 police encounters with mentally disordered suspects, Engel and Silver (2001) found an average of 7.03 bystanders (standard deviation = 9.42). Perform a hypothesis test to determine if there are more bystanders when the suspect is mentally disordered. Use a 0.01 level of statistical significance.

What is the alternative hypothesis?

Group of answer choices

H1:>3.58

H1:<3.58

H1:>7.03

H1:<7.03

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Question 23

1pts

Assume that the average age at which students graduate high school is 17.6. Exum (2002) asked 84 male students at a large Mid-Atlantic University the age at which they had their first alcoholic drink. On average, these 84 students had their first alcoholic drink at 16.54 years of age (standard deviation = 2.03). Perform a hypothesis test to determine if the average person has his/her first alcoholic drink before graduating high school (i.e., if the average age of first drink is less than 17.6). Use a 0.05 level of statistical significance.

What is the alternative hypothesis?

Group of answer choices

H1: <17.6

H1: >17.6

H1: <16.54

H1: >16.54

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Question 24

1pts

In general, five year old can completes spatial reasoning test in approximately 8 seconds.A preschool teacher wants to see how her kids in her school fair on the test.She administers the test to the 55 students in her class and finds that on average they complete the test in 12.3 seconds, with a standard deviation of 9.8.Using a 0.01 significance level, he teacher finds the following:

H1:8

z: +/- 2.57

z = -3.26

Based on this information, what would you conclude?

Group of answer choices

Fail to reject the null hypothesis

Reject the null hypothesis