Mathematics

  1.  What is the age distribution of promotion-sensitive shoppers? A supermarket super shopper is defined as a shopper for whom at least 70% of the items purchased were on sale or purchased with a coupon.
    Age range, years 18-28 29-39 40-50 51-61 62 and over
    Midpoint x 23 34 45 56 67
    Percent of super shoppers 5% 41% 26% 11% 17%

    For the 62-and-over group, use the midpoint 67 years.

    (a) Using the age midpoints x and the percentage of super shoppers, do we have a valid probability distribution? Explain.

    (b) Use a histogram to graph the probability distribution of part (a).

    (c) Compute the expected age μ of a super shopper. (Round your answer to two decimal places.)
    μ =

    (b) Use a histogram to graph the probability distribution in part (a).

    (c) Find the probability that a British nurse selected at random in 1851 would be 60 years of age or older. (Round your answer to three decimal places.)
    Question 1

     

    An independent-measures t test produced a t statistic with df = 20. If the same data had been evaluated with an analysis of variance, what would be the df values for the F-ratio?

    Answer

    a. 1, 20
    b. 2, 20
    c. 1, 19
    d. 2, 19

    Question 2

     

    An analysis of variance comparing three treatment conditions produces dftotal = 24. For this ANOVA, what is the value of dfwithin?

    Answer

    a. 3
    b. 2
    c. 21
    d. 22

    Question 3

     

    A researcher uses analysis of variance to test for mean differences among four treatments with a sample of n = 6 in each treatment. The F-ratio for this analysis would have what df values?

    Answer

    a. df = 3, 15
    b. df = 4, 24
    c. df = 3, 5
    d. df = 3, 20

    Question 4

     

    For an analysis of variance comparing four treatments, MSbetween = 12. What is the value of SSbetween?

    Answer

    a. 4
    b. 48
    c. 36
    d. 3

    Question 5

     

    An analysis of variance produces SSwithin = 40 and MSwithin = 10. In this analysis, how many treatment conditions are being compared?

    Answer

    a. 4
    b. 5
    c. 50
    d. 30

    Question 6

     

    An analysis of variance comparing three treatment conditions produces dftotal = 24. For this ANOVA, what is the value of dfbetween?

    Answer

    a. 2
    b. 3
    c. 22
    d. 21

    Question 7

     

    An independent-measures research study compares three treatment conditions using a sample of n = 5 in each treatment. For this study, the three sample totals are, T1 = 5, T2 = 10, and T3 = 15. What value would be obtained for SSbetween?

    Answer

    a. 15
    b. 5
    c. 1
    d. 10

    Question 8

     

    An independent-measures research study compares three treatment conditions using a sample of n = 5 in each treatment. For this study, the three sample totals are, T1 = 5,  T2 = 10, T3 = 15, and 2 = 75 for the entire set of scores. What value would be obtained for SStotal?

    Answer

    a. 15
    b. 5
    c. 10
    d. 1

    Question 9

     

    The following table shows the results of an analysis of variance. Based on this table, what is the value for ?2, the percentage of variance accounted for?

    Source SS df MS  
    Between 16 2 8 F = 2.00
    Within 84 21 4  
    Total 100 23    

    Answer

    a. 16/100
    b. 16/18
    c. 84/100
    d. 4/10

    Question 10

     

    The following table shows the results of an analysis of variance comparing two treatment conditions with a sample of n = 11 participants in each treatment. Note that several values are missing in the table. What is the missing value for the F-ratio?

    Source SS df MS  
    Between xx xx 14 F = xx
    Within xx xx xx  
    Total 154 xx    

    Answer

    a. 28
    b. 2
    c. 7
    d. 14

    Question 11

     

    An analysis of variances produce SSbetween = 20, SSwithin = 30, and an F-ratio with df = 2, 15. For this analysis, what is the F-ratio?

    Answer

    a. 30/20 = 1.50
    b. 20/30 = 0.67
    c. 10/2 = 5.00
    d. 2/10 = 0.20

    Question 12

     

    An experiment compares three treatment conditions with a separate sample of n = 10 in each treatment. If the data are analyzed with ANOVA, the analysis would have dftotal = _____.

    Answer

    a. 29
    b. 28
    c. 27
    d. 30

    Question 13

     

    An independent-measures research study compares three treatment conditions using a sample of n = 10 in each treatment. For this study, the three samples have SS1= 10,  SS2 = 20, and SS3 = 15. What value would be obtained for MSwithin?

    Answer

    a. 45/27
    b. 45/3
    c. 45/29
    d. 45/30

    Question 14

     

    For an F-ratio with df = 2, 10, the critical value for a hypothesis test using a = .05 would be _____.

    Answer

    a. 99.40
    b. 4.10
    c. 19.39
    d. 7.56

    Question 15

     

    The following table shows the results of an analysis of variance comparing three treatment conditions with a sample of n = 10 participants in each treatment. Note that several values are missing in the table. What is the missing value for SStotal?

    Source SS df MS  
    Between 20 xx xx F = xx
    Within xx xx 2  
    Total xx xx    

    Answer

    a. 30
    b. 54
    c. 22
    d. 74

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