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A carpet manufacturer is studying differences between two of its major outlet stores. The company has decided to revise and improve its operations and response time to customer needs and is particularly interested in the time it takes customers to receive carpeting that was ordered from the plant. A sample of 41 delivery times for the most popular type of carpet for store A revealed an average delivery time 34.3 days with a standard deviation of 2.4 days. A similar sample of 31 delivery times for store B revealed an average of 43.7 days with a standard deviation of 3.1 days. At the .05 level of significance, is there evidence of a difference in variability in the shipping time between the two outlets? What decision should the carpet manufacturer make?
Normal approximation to the Binomial distribution - Evaluate the probability that at least 195 of the students are female.
A random sample of 15 paired observations has a correlation of -.46. Can we conclude that the correlation in the population is less than zero? Use the .05 significance level.
Supposing a linear relationship, use the least squares method to find the regression coefficients b 0 and b 1 .
What is 95% confidence interval estimate for average number of years served by all Supreme Court justices?
Construct a test of 20 objective type items in your subject. Administer test to a group of 50 students conduct an item analysis and write a report. Explain the meaning of co-efficient of correlation. Why does the homogeneity and heterogeneity of sco..
Hypothesis test for difference between two population variances - compare the variation in the selling price of homes on the oceanfront with those one to three blocks from the ocean.
Twelve doctor's offices were given 3 lab inspections with the following results:
Explain the relationship between total gross and opening gross total gross and number of theatres total gross and week in top 60.
Below you are given a partial computer output based on a sample of 21 observations, relating an independent variable (x) and a dependent variable (y).
Identify the type of sampling (random, systematic, convenience, stratified, cluster) used when a sample of people who smoke is obtained as described below.
Below are scores for 10 randomly selected students on each exam. 95% confidence interval for the mean scores on?
Compute standard error of mean? Compute the margin of error, with 95% confidence.
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