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1. According to a recent National Association of Colleges and Employers (NACE) report, 48% of college student internships are unpaid. (Source: "Just 38 Percent of Unpaid Internships Were Subject to FLSA Guidelines," bit.ly/Rx76M8.) A recent survey of 60 college interns at a local university found that 30 had unpaid internships. a. Use the five-step p-value approach to hypothesis testing and a 0.05 level of significance to determine whether the propor-tion of college interns that had unpaid internships is different from 0.48.b. Assume that the study found that 37 of the 60 college interns had unpaid internships and repeat (a). Are the conclusions the same?
2. You are the manager of a restaurant that delivers pizza to college dormitory rooms. You have just changed your delivery process in an effort to reduce the mean time between the order and completion of delivery from the current 25 minutes. A sample of 36 orders using the new delivery process yields a sample mean of 22.4 minutes and a sample standard deviation of 6 minutes.a. Using the six-step critical value approach, at the 0.05 level of significance, is there evidence that the population mean deliv-ery time has been reduced below the previous population mean value of 25 minutes?b. At the 0.05 level of significance, use the five-step p-value ap-proach.c. Interpret the meaning of the p-value in (b).d. Compare your conclusions in (a) and (b).
Could you please insert these into excel? Showing work?
Compute the number of French fries that would have to be sampled and measured to be 98% sure of being within 0.4 cm of the true mean.
The week 5 assignment addressed point and confidence interval estimation, one of the two major divisions of inferential statistics. The remaining weeks of this course bring together everything we've covered in this course thus far in our study of ..
What are the correlation coefficients of the X variables (non-transformed) against the Y? Do they agree with your opinion about the best fit?
when the null hypothesis for an anova analysis comparing four treatment means is rejectedselect onea. 4 comparisons of
(a) Can we conclude that 34% of all drivers have driven with a pet on their lap? (b) Explain why it is not appropriate to generalize these results to all drivers, or even to all drivers who visit cnn.com. What is the problem with this method of..
Once an individual has been infected with a certain disease, let X represent the time (days) that elapses before the individual becomes infectious.
In a sample of 30 randomly selected women, it was found that their mean height was 63.4 inches. From previous studies, it is assumed that the standard deviation is 2.4.
Find the probability that Mary obtains exactly one Head and so does John. [Hint: We assume that Mary's tosses are completely independent from John's.]
Compare these with the percentages specified by Tchebysheff's Theorem.
The joint cumulative distribution function for (X, Y) is given by F(x, y) = ( 1 - e-x/ID - e-y/l + e-lx+SyJ/I0)/10,001 (x)I10,oodY).
what are the z scores above and below the mean that contain the middle 90 of a normal
Show that Ef [h(X)] can be computed in closed form and derive its value.- Construct a regular Monte Carlo approximation based on a normal N (0, 1)sample of size Nsim=10^3 and produce an error evaluation.
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