Question 9

1pts

Create 95% confidence interval around a mean of 12 with a standard deviation of 2.1, with a sample size of 95.What is the upper bound for this confidence interval?

Group of answer choices

12.42

12.56

11.58

12.02

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Question 10

1pts

Create a 95% confidence interval around a mean of 12 with a standard deviation of 2.1, with a sample size of 95.For this confidence interval, what would be the critical value you'd use?

Group of answer choices

1.96

1.65

2.33

2.57

When using the standardized normal distribution, about 99% of all scores fall between 3 standard deviations above and below the mean.

Group of answer choices

True

False

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Question 13

1pts

In general, men that are rapists have typically committed several rapes before getting caught.We decide to ask incarcerated rapists to report how many rapes they've committed in their lifetime.We talk to 120 incarcerated rapists.Their average number of rapes is 5.8.The standard deviation is 2.4.Construct a 99% confidence interval around the mean.

What is yourUPPERbound for the confidence interval?

Group of answer choices

6.37

5.98

6.25

6.02

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Question 14

1pts

Kingsnorth et al. (2002) examined the case processing time (in days) from arraignment to disposition for cases processed by the Sacramento County District Attorney's office.For the 90 cases that resulted in a felony conviction, the mean processing time was 113.6 days with a standard deviation of 175.53. Construct 95% confidence intervals for the mean.

What is the LOWER bound for this confidence interval?

Group of answer choices

77.13

77.63

80.02

76.20

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Question 15

1pts

Let's say you have a sample of 10 young males who have committed serious offences over the course of their lives.The average age at first arrest is 12, with a standard deviation of 2.3. Construct a 95% confidence interval around the mean.

What is yourUPPERbound?

Group of answer choices

13.73

12.36

12.50

13.05

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Question 16

1pts

In a two-year survey of 100 census tracts in Seattle (WA), Rountree and Warner (1999) observed a mean official violent crime rate of 27.06 per 1,000, with a standard deviation of 33.81. Construct a 95% confidence interval around this mean.

What is thelowerbound for this confidence interval?

Group of answer choices

20.40

21.56

22.65

23.89

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Question 17

1pts

Assume that when victims are asked how well their needs were met by the criminal justice system on a scale of 1 (not met at all) to 5 (met completely), the average response is 3.24. In a study of 130 victims, Brewster (2001) found that the average response to how police officers met victims' needs was 2.90 (standard deviation = 1.44). Perform a hypothesis test to determine if police officers respond less well to victims' needs than the criminal justice system as a whole. Use a 0.05 level of statistical significance.

What is your test statistic?

Group of answer choices

-2.61

2.61

2.69

-2.69

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Question 18

1pts

Assume that the international average homicide victimization rate is 2.92 (per 100,000). In a sample of 24 industrialized nations, LaFree and Drass (2002) found that the mean homicide victimization rate was 1.49 (per 100,000; standard deviation = 0.44). Perform a hypothesis test to determine if the mean homicide rate in industrialized nations is different than the international average. Use a 0.05 level of statistical significance.

What is your critical value?

Group of answer choices

-1.714/1.714

-2.500/2.500

-2.069/2.069

-2.063/2.063