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You want to compare the daily sales for two different designs of Web pages for your internet business. You assign the next 62 days to either Design A or Design B, 31 days each. The summary statistics for the test are shown in part (d) on the next page. Suppose Design A is the current design and Design B is a proposed new design. The hypothesis is that Design B is superior to Design A.
a) Would you use a one-sided or two-sided test for this example.Why?
b) State the null and alternative hypothesis corresponding to your answer for (a).
c) What would the critical value be? Use α = 0.05
d) Suppose the following output is obtained from Excel. Conduct the significance test corresponding to your answer to (b) above. What is the result of the significance test? SOLVE AND INTERPRET CLEARLY AND THOROUGHLY.
Calculate the mean yearly value using the average gas prices by month found in the Final Project Data Set. What is the slope of the linear regression line and what is the Y-intercept of the linear regression line
A foreign language course and a psychology course?
When using the binomial probability distribution for analyzing guesses on a multiple-choice quiz, what is wrong with letting "p" denote the probability of getting a correct answer while "x" counts the number of wrong answers?
Let X and Y be discrete random variables with joint pdf f(x, y) = 4/(5xy) if x = 1, 2 and y = 2, 3, and zero otherwise. Find: (a) E(X). (b) E(Y).
A paper company is interested in estimating the proportion of trees in a 500-acre forest with diameters exceeding 2 feet. The company selects 25 plots (100 feet by 100 feet) from the forest and utilizes the information from the 25 plots to help..
Diane Brown is the mayor of a large city. Lately, she has become concerned about the possibility that large numbers of people who are drawing unemployment checks are secretly employed. Her assistants estimate that 40% of unemployment benefi..
Describe each r value in words
Wilco is a manufacturer in a mature cyclical industry. During the most recent industry cycle, its net income averaged $30 million per year with a standard deviation of $10 million (n=6 observations). Management claims that Wilco's performance during ..
Using the information from part by hand, calculate a 90 confidence interval for the difference of the means for the two time periods.
The LDL cholesterol levels in a certain population has the distribution N(5.9, 0.8). 1. What is the cholesterol level of the 'healthiest' (i.e. lowest!) 20%?
The mean life span of a brand name tire
1. unemploymenta. suppose that 98 million people work and 5 million seek work. what is the unemployment rate?b. now
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