A busy grocery store in San Antonio captures the time per item it takes to check out customers during their peak time. (The total time for the customer was divided by the number of items for that customer. If a customer took 8 minutes, or 480 seconds, to check out and purchased 24 items, the time would be 20). A sample of times is calculated for each cashier. They want to compare 2 cashiers. The following are the average time per item scanned in seconds for each cashier: Cashier 1 Cashier 2 Time per Item Scanned Time per Item Scanned 20 24 10 16 52 19 60 55 65 45 58 36 40 5 38 29 40 52 25 45 35 15 40 19 35 28 27 28 15 30 16 28 18 19 Compare the following (a through k) for these two cashiers and then help the store determine which of the two cashiers has better metrics (explain why): Cashier 1 Cashier 2 d. Q3 (or 75thPercentile e. Standard Deviations f. Ranges

ABC university claims that because of its superior facilities and close faculty supervision, its students complete the Ph.D program earlier than usual. They base this assertion on the fact that the population mean age for the for completion is u=32.11. Their n=31 Ph.D's have a mean age of M=30.89, with a standard deviation of s=4. Test the validity of this assertion using a two-tailed year with alpha set to =.05.

An insurance company crashed four cars in succession at 5 miles per hour. The cost of repair for each of the crashes was $421,$465,$412,$218. Compute the range of data

Three products were used in a hot summer to keep the pool chlorine level high. Each product was used in 6 pools, and there was a total of 18 pools in the experiment. The same amount of chlorine was added to each pool (A, B, or C) and the conditions such as pool size, temperature, sun exposure etc. were similar. The chlorine levels (%) were measured and recorded after 24 hours of using the products. The percentages in the table below are the percentage of the chlorine added to the pool remaining after this 24 hours. The data is as follows: A 96 56 52 66 70 60 B 44 36 34 50 40 48 с 723227 34 40 20 24 a) Find the overall mean of the chlorine level across all the pools measured, and then find the mean of the chlorine level for each product.

In a sample of 169 students, 16 said they have donated blood. What percent of the students have donated blood?

Dr. A. Ventura is interested in determining what kinds and how many pets people own in Bakersfield. He stands outside Petco and asks people what kind of pet they own. This is the result of his survey: dog=1; cat=2; bird=3; reptile=4; fish=5; other=6 1,1,2,2,2,1,1,3,2,3,1,1,1,2,2,4,4,2,2,1,1,1,5,4,3,4,1,1,1,2,2,6,1,1,2,2,1,2,1,2,6,3,4,5

A researcher hypothesized that cytokinins and auxins supplied by tumor-inducing insects lead to the production of tumors in plants. She performed experiments in which she hypodermically injected green pepper plants to determine if she could induce tumors. In one experiment she varied the concentration of cytokinin and the ratio of auxin concentration to cytokinin concentration. She used 3 concentrations of cytokinin and 6 ratios of auxin/cytokinin. The concentrations are indexed (1-3) with 3 indicating the highest concentration of cytokinin. The 6 ratios of auxin/cytokinin varied from 0.125 to 5.0 with values greater than 1 indicating that auxin was in greater concentration than cytokinin. The resulting data are in the date file "auxcyt.csv". The measured sizes of the tumors induced (relative to controls) are given in the 3rd column ('sumdiffd'). Analyze these data testing the appropriate hypotheses and interpret the results. (Note the unequal sample sizes.) auxcyt data…

A group of 500 students take a survey about distance learning.  150 prefer distance learning.  What is the proportion of students that prefer distance learning.

I can't understand why the data is the percentage of surveyed parents.

Please explain