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Textbook Prices, UCSB vs. CSUN
The prices of a sample of books at University of California at Santa Barbara (UCSB) were obtained by statistics students Ricky Hernandez and Elizabeth Alamillo.
Then the cost of books for the same subjects (at the same level) were obtained for California State University at Northridge (CSUN).
Assume that the distribution of differences is Normal enough to proceed, and assume that the sampling was random. The data are at this text's website.
a. First find both sample means and compare them.
b. Test the hypothesis that the population means are different, using a significance level of 0.05.
a new analytical method to detect pollutants in water is being tested. this new method of chemical analysis is
(a) Find an expression which serves as a linear approximation for l at h=1000 m. (b) Give two assumptions you think have been made in deriving the expression above.
For the following data, verify that you do not reject with the ANOVA F testing with α = .05, but you do reject with Welch's test.- What might explain the discrepancy between the two methods?
A Geiger counter used in a spent nuclear fuel area records on the average of 40 counts per min. Determine the probability that there will be 2 counts in a 6-sec period.
What symbol is used to represent the mean of the sampling distribution of y-(ybar)? Explain and what symbol is used to represent one value from the sampling distribution of y-(ybar)? Explain
A major investment company wanted to know what proportions of investors bought stocks, bonds, both stocks and bonds, and neither stocks nor bonds.
the stats on heart disease a year is about 600000 americans die yearly. in 2008 these were the percentages according to
A town has 15 neighborhoods. If you interviewed everyone living in one particular neighborhood, would you be interviewing a population or a sample.
At the 0.10 level of significance, test the null hypothesis that the population variances are equal. Would your conclusion be different if the test had been conducted at the 0.05 level? At the 0.02 level?
Find the height such that about 25% of college women are shorter than that height. What is the percentile ranking for that height?
To investigate he selects a sample of eight weeks and determines the number of new cars sold and the number of sales people on duty for that week. a) What are the dependent and independent variables?
a. Create a single index series for prices with Year 0 as the base year. b. Create a single index series for wages with Year 0 as the base year.
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