Stats Help for College-level Students

Probability

An urn contains 8 red chips, 10 green chips and 2 white chips. A chip is drawn and replaced and then a second chip is drawn. What is the probability of: A). a white chip on the first draw B). a white chip on the first draw and a red on the second C). two green chips being drawn D). a red chip on the second dra ...continues

Standard Deviation

Calculate the mean, median mode and standard deviation for each variable in the following data set. Note that the variables are the columns.

Working with inference.

What is the difference in the average daily hotel room rates between Minneapolis and New Orleans? Suppose we want to estimate this difference by taking hotel rate samples from each city and using a 98% confidence level. The data for such a study follows. Use this data to produce an interval estimate and also a point estimat ...continues

Inference

Various types of retail outlets sell toys during the holiday season. Among them are specialty toy stores, the large discount toy stores, and other retailers that carry toys as only one part of their stock of goods. Is there any difference in the dollar amount of a customer purchase between a large discount toy store and a spec ...continues

Probability

2. The probability that a person is immune to a certain disease is 0.40. a) What is the probability that 4 people will have the disease in a sample of 12 people b) Find the mean number of people who have immunity in a sample size of 12. c) Find the standard deviation for the same sample 3. If the capacities of the cran ...continues

Statistics

5. Human body temperatures are normally distributed with a mean of 98.6 degrees F and a standard deviation of 0.72 deg. F. Find the temperature that separates the top 7% from the bottom 93%. 6. In a sample of 49 adolescents who served as the subjects in an immunologic study, one variable of interest was the diameter of skin ...continues

Hypothesis test using ANOVA, Chi-square

8.To examine the effect of pets in stressful situations researchers recruited 45 women who said they were dog lovers. Fifteen of the subjects were randomly assigned to each of the 3 groups to do a stressful task alone with a good friend present, or with their dog present. (The stressful task was to count backwards by 13s or 17s) ...continues

Statistics

Archaeopteryx is an extinct beast having feathers like a bird but teeth and a long bony tail like a reptile. Five fossil specimens have preserved both the femur and humerus bones. The measurements (in centimeters) for each bone are given below. Femur 38 56 59 64 74 Humerus 41 63 70 72 84 Femur 38 56 59 64 74 ...continues

Regression Interpretation

A manufacturer of a new type of home insulation wants to develop guidelines for builders and consumers regarding the effects on natural gas consumption (1) of the thickness of the insulation in the attic of the home and (2)of the outdoor temperature. In the laboratory they varied the insulation thickness and temperature. A few ...continues

Regression Interpretation: Testing a Hypothesis.

In a multiple regression equation two independent variables are considered, and the sample size is 25. The regression coefficients and the standard errors are as follows. b1=2.676-----sb1=0.56 b2=-0.880----sb2=0.71 Conduct a test of hypothesis to determine whether either independent variable has a coefficient equal to ze ...continues