Question

Instructions: For this discussion, everyone in a prior class told me how many siblings they have.

That data is in the chart (below). For example, if someone had three siblings, then they put an X

in the row for Three Siblings. First, determine the frequency of siblings. Then answer the

questions that follow/

Number of Siblings

Running Tally of Number of Siblings (Brothers and

Sisters) (Put a x each time the category applies)

Frequency

Zero (no) siblings xxxxxxxxxxx 11

One sibling xxxxxxxxxxxxxxxxxxxx 20

Two siblings xxxxxxxxxxxxxxx 15

Three siblings xxxxxxxx 8

Four siblings xxxxxx 6

Five siblings xxx 3

Six siblings xxxx 4

Seven siblings x 1

Eight siblings xxx 3

After finding the frequencies, I chose four students at random from the class. Your job is to tell

me if these four students (A. B. C, and D) differ in the number of siblings they have compared to

the average for the population. Remember, you need to calculate the population standard

deviation first!

Student

Number of Siblings for Student A, B, C, and D

A 3

B 2

C 1

D 1

Your job is to determine if the number of siblings for our sample (The average of Students A, B,

C, and D) differ significantly from what you would expect given the population of this prior

class. As you work on this problem, make sure to provide information for each of the eight steps

we cover in Chapter 10 (Salkind) as well as the APA write-up you would see in a results section.

1. State the null and alternative hypotheses

2. Tell me your level of risk

3. Determine the best statistical test to use

4. Compute the test statistic

5. Determine the value needed to reject the null hypothesis

6. Compare the obtained and critical value

7. Decide whether you will retain the null hypothesis or ...

8. Decide whether you will reject the null hypothesis

9. Finally, write up your results as you would see it in a results section of an empirical

research paper.

Answer 1

1. H0 (Null Hypothesis): There is no significant difference in the number of siblings between the sample and the population.

H1 (Alternative Hypothesis): There is a significant difference in the number of siblings between the sample and the population.

2. The level of risk that will be 0.05.

3. The best statistical test for this study is the t-test.

4. The t-value is 1.88337. The p-value is .086344. The result is not significant at p < .05.

Please post the other questions separately as we are supposed to answer just one question or four subparts of a question.