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Carnegie Mellon University maintains a site with many interesting data sets for use in the classroom. Some of these data sets are stored at https://stat.cmu.edu/DASL/allsubjects.html.
Go to this web page, look under psychology, download the file called scents and read the file into an R variable called scent. The last six columns contain the time participants required to complete a pencil and paper maze when they were smelling a floral scent and when they were not. The columns headed by U.Trial.1, U.Trial.2, and U.Trial.3 are the times for no scent, which were taken taken on three different occasions.
Compare scent and no scent data for occasion 1 using difference scores via the command trimci(scent[,7]-scent[,10],tr=0), so the mean of the difference scores is being used. Verify that the p-value is 0.597.
The railroad industry's cost structure is different than that of the motor carrier industry. What factors contribute to this difference? What impact do these differences have for the railroads in terms of pricing, competitiveness, and investment?
in 1990 the mean height of women 20 years old age or older was 63.7 inches with a standard deviation of 2.1 inches
a company is criticized because only 19 of 49 executives at a local branch are women. the company explains that
based on the certain data a null hypothesis is rejected at the 0.05 level of significance. would it also be rejected at
The capstan-slide system of Figure CDP4.1 uses a PD controller. Determine the necessary values of gain constants of the PD controller so that the deadbeat response is achieved. Also, we want the settling time (with a 2% criterion) to be less than..
Why is a z score a standard score? Why can standard scores be used to compare scores from different distributions?
In a semiconductor manufacturing process, three wafers from a lot are tested. Each wafer is classified aspassorfail. Assume that the probability that a wafer passes the test is 0.8 and that wafers are independent.
to test the hypothesis h0 ? 100 vs. h1 ? gt 100 a z-score of 2.8 is calculated. the probability of observing a z-score
an inspector chooses a sample of parts coming from an automated lathe by visually inspecting all parts and then
f. Make all pairwise comparisons between the treatment effects: use either the Bonferroni or the Scheffe procedure with a 90 percent family confidence coefficient. whichever is more efficient. State your findings.
confidence interval estimate for the meandata nbspsample standard deviationnbsp1.9667sample meannbsp 20.73sample
What is the standard deviation of the number of service calls and compute the coefficient of variation of the number of service calls.
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