Week 14 -Assignments

Statistics

Question 1

Parametric tests (such as t or ANOVA) differ from nonparametric test (such as chi-square) primarily in terms of the assumptions they require and the data they use. Explain these differences.

Question 2

A major snack food company has started an advertising campaign claiming that it makes "America’s favorite potato chip." To test this claim, a researcher assembles a sample of 90 volunteers and asks each individual to taste the company’s chips along with two other brands. Each individual is asked to select a favorite from the three brands. The following data show the number of individuals selecting each brand. Do the data provide significant support for any preferences among the three brands? Test at the .05 level of significance.

Brand A Brand B Brand C

38 28 24

A developmental psychologist would like to determine whether infants display any color preferences. A stimulus consisting of four color patches (red, green, blue, and yellow) is projected onto the ceiling above a crib. Infants are placed in the crib, one at a time, and the psychologist records how much time an infant spends looking at each of the four colors. The color that receives the most attention during a 100-second test period is identified as the preferred color for that infant. The preferred colors for a sample of 60 infants are shown in the following table:

Red Green Blue Yellow

21 11 18 10

Do the data indicate any significant preferences among the four colors? Test at the .05 level of significance.

rtions, at the 0.05 significance level.

Question 12

Friedman and Rosenman (1974) have suggested that personality type is related to heart disease. Specifically, Type A people, who are competitive, driven, pressured, and impatient, are more prone to heart disease. On the other hand, Type B individuals, who are less competitive and more relaxed, are less likely to have heart disease. Suppose that an investigator would like to examine the relationship between personality type and disease. For a random sample of individuals, personality type is assessed with a standardized test. These individuals are then examined and categorized as to whether they have a heart disorder. The observed frequencies are as follows:

No heart disease Heart disease

Type A 32 18 50

Type B 128 22 100

_____ _____

160 40

Is there a relationship between personality and disorder? Test at the .05 level of

significance.

SPSS Assignment

Complete Week 14 Assignment 1 in SPSS Assignments.doc (provided under Doc Sharing ).

Use copy or copy object and paste the output from the Analyze>Descriptive Statistics>Crosstabs… command into your Assignment Worksheet. Also provide a one-paragraph interpretation of the data in the table.

Week 14 Assignment 1:

Using Crosstabs for Chi-Square

The first step in this assignment is to provide SPSS with the Value Labels for the values in LOCALE97. To do this, refer back to the steps discussed on page 15-16 of this document.

According to the codebook:

LOCALE97 12 METROPOLITAN STATUS

1 = LARGE CITY

2 = MID-SIZE CITY

3 = URBAN FRINGE OF A LARGE CITY

4 = URBAN FRINGE OF A MID-SIZE CITY

5 = LARGE TOWN

6 = SMALL TOWN

7 = RURAL

Using Analyze>Descriptive Statistics>Crosstabs… generate a table which crosstabulates locale97 with freelnch to assess the relationship between school location and socioeconomic status. The table should have correct value identifiers from the codebook and each cell should show the percentage of total schools represented by each cell. In order to get a table for "display quality", you should have freelnch as the "column" variable and locale97 as the "row" variable. Make sure that you select Chi-Square in the "Statistics".

Use Copy or Copy Objects to cut and paste the appropriate output tables into the Assignment Worksheet for this week. In one paragraph, provide your analysis and interpretation of the table and the nature of the relationship.

Price: $19.35

Solution: The downloadable solution consists of 9 pages, 1035 words and 2 charts.
Deliverable: Word Document