Purchase Solution

Statistics

Not what you're looking for?

Ask Custom Question

Show all work for Problems 2 and 18; Check answers for 6 only.

2. The student population at the state college consists of 55% females and 45 % males.

a. The college theater department recently staged a production of a modern musical. A researcher recorded the gender of each student entering the theater and found a total of 385 females and 215 males. Is the gender distribution for theater goers significantly different from the distribution for the general college? Test at the /05 level of significance.

b. The same researcher also recorded the gender of each student watching a men's basketball game in the college gym and found a total of 83 females and 97 males. Is the gender distribution for basketball fans significantly different from the distribution for the general college? Test at the .0555 level of significance.

6. Langewitz, Izakovic, and Wyler (2005) reported that self-hypnosis can significantly reduce hay fever symptoms. Patients with moderate to severe allergic reactions were trained to focus their minds on specific locations where their allergies do not bother them, such as a beach or a ski resort. In a sample of 64 patients who received this training, suppose that 47 showed reduced allergic reactions and 17 showed an increase in allergic reactions. Are these results sufficient to conclude that the self-hypnosis has a significant effect? Assume that increasing and decreasing allergic reactions are equally likely if the training has no effect. Use a-.05

H0: The training has no effect and that increasing and decreasing are equally likely, Fe=pm=1/2(64)=32
H1: The training does have a significant effect
Assumptions: Expected frequencies â?¥5
a=.05
df=1
Critical regio=3.84
Test value x^(2=â?'(Fo-Fe)^2 )=(47-32)²+(17-32)²
Fe 32 32
=14.06

X²=14.06 falls in reject H0 region
Conclude that the training has a significant effect on allergic reactions

18. Reseaech results suggest that IQ scores for boys are more variable than IQ scores for girls(Arden & Plomin, 2006). A typical study looking at 10-year old children classifies participants by gender and by low, average, or high IQ. Following are hypothetical data representing the research results. Do the data indicate a significant difference between the frequency distribution for males and females? Test at the .05 level of significance and describe the difference.
Low IQ Avg High
Boys 18 42 20 80
Girls 12 54 14 80
n=160

Purchase this Solution

Solution Summary

Complete, Neat and Step-by-step Solutions are provided in the attached files.

Purchase this Solution


Free BrainMass Quizzes
Measures of Central Tendency

Tests knowledge of the three main measures of central tendency, including some simple calculation questions.

Terms and Definitions for Statistics

This quiz covers basic terms and definitions of statistics.

Know Your Statistical Concepts

Each question is a choice-summary multiple choice question that presents you with a statistical concept and then 4 numbered statements. You must decide which (if any) of the numbered statements is/are true as they relate to the statistical concept.

Measures of Central Tendency

This quiz evaluates the students understanding of the measures of central tendency seen in statistics. This quiz is specifically designed to incorporate the measures of central tendency as they relate to psychological research.