Purchase Solution

General Statistics s

Not what you're looking for?

Ask Custom Question

Am having difficulty plugging in the correct values into the formulas to be sued. If you can please provide step by step work out of the following problems. Begin with formula to be used and then work out so i can see where values go I would appreciate it.

2) A biologist suspected that in the 20-24 age group, males have a higher mean diastolic blood pressure than females.
The data are:
n x (mean) s2
(male) A 45 75 10.1

(female) B 45 70 9.8

Use a .01 level of significance to test the biologist's suspicion.

3) The mayor of city A claimed that there was not difference in mean air quality of cities A and B. Independent samples for each city gave the following data:

n x (mean) s2

City A 11 3.8 .39

City B 11 3.5 .10

Using a .05 level of significance, test the claim.

4) A state politician wanted to determine if there was any difference in her support between the eastern and western parts of the state. In a sample from each sector of size 150, 90 of the voters in the east and 80 in the west satisfied with her performance. At the .05 level of significance, test whether there is any difference in her support between the eastern and western parts of the state.

5) For the data given below, find the equation of the regression line

x y

. 1 2
2 4
3 3
4 6

6) For the data given above in problem 5, compute the correlation coefficient.

7) A sample of 50 movie-goer was taken to see if the rating of a
Controversial movie and age of viewer are related. The following data were obtained:

excellent fair poor

< 30 6 12 8

30 or older 10 6 8.

Purchase this Solution

Solution Summary

Provided is step-by-step work beginning with the formula to be used in the given general statistics problems.

Solution provided by:
Education
  • BSc , Wuhan Univ. China
  • MA, Shandong Univ.
Recent Feedback
  • "Your solution, looks excellent. I recognize things from previous chapters. I have seen the standard deviation formula you used to get 5.154. I do understand the Central Limit Theorem needs the sample size (n) to be greater than 30, we have 100. I do understand the sample mean(s) of the population will follow a normal distribution, and that CLT states the sample mean of population is the population (mean), we have 143.74. But when and WHY do we use the standard deviation formula where you got 5.154. WHEN & Why use standard deviation of the sample mean. I don't understand, why don't we simply use the "100" I understand that standard deviation is the square root of variance. I do understand that the variance is the square of the differences of each sample data value minus the mean. But somehow, why not use 100, why use standard deviation of sample mean? Please help explain."
  • "excellent work"
  • "Thank you so much for all of your help!!! I will be posting another assignment. Please let me know (once posted), if the credits I'm offering is enough or you ! Thanks again!"
  • "Thank you"
  • "Thank you very much for your valuable time and assistance!"
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.