Statistics help test - 99180

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Find the critical X2 -value to test the claim σ2 < 5.6 if n = 28 and α = 0.10.

 

 

18.114

 

 

36.741

 

 

16.151

 

 

14.573

 

1 points  

Question 2

A random sample of 160 car crashes are selected and categorized by age. The results are listed below.

               

 

The age distribution of all drivers for the given categories is:

            18% for the under 26 group,

            39% for the 26-45 group,

            31% for the 45-65 group,

    and  12% for the group over 65.

Calculate the chi-square test statistic χ2 to test the claim that all ages have crash rates proportional to their driving rates.

 

 

85.123

 

 

95.431

 

 

101.324

 

 

75.101

 

1 points  

Question 3

Each side of a standard six-sided die should appear approximately 1/6 of the time when the die is rolled.

A player suspects that a certain die is loaded. The suspected die is rolled 90 times. The results are shown below. Calculate the chi-square test statistic χ2 to test the player's claim.

 

                         

 

 

2.143

 

 

5.013

 

 

3.067

 

 

4.312

 

1 points  

Question 4

The daily intakes of milk (in ounces) for ten randomly selected people were:

 

    26.0   13.0   13.5   14.8   19.1

    13.6   21.6   30.8   15.8   14.1

 

Use this data to find a 99% confidence interval for the population standard deviation σ.

 

 

0.88 oz < σ < 3.38 oz

 

 

3.78 oz < σ < 12.51 oz

 

 

3.78 oz < σ < 13.92 oz

 

 

3.65 oz < σ < 12.51 oz

 

1 points  

Question 5

A study was performed at a university to analyze whether the preference for hamburgers or fried chicken is related to the gender of the student. This table lists the results of the study. At  = .05, test the claim that the meal preference and the gender of the student are not related.

 

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hw13.docx