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The following are zinc concentrations (in mg/ml) in the blood for two groups of rats. Group A received a dietary supplement of calcium, and group B did not. Researchers are interested in variations in zinc level as a side effect of dietary supplementation of calcium.
Group A: 1:31 1:45 1:12 1:16 1:30 1:50 1:20 1:22 1:42 1:14 1:23 1:59 1:11 1:10 1:53 1:52 1:17 1:49 1:62 1:29
Group B: 1:13 1:71 1:39 1:15 1:33 1:00 1:03 1:68 1:76 1:55 1:34 1:47 1:74 1:74 1:19 1:15 1:20 1:59 1:47
(a) Make a back-to-back stem-and-leaf diagram (by hand) for these measurements.
(b) Use the computer to draw side-by-side box plots.
the yearly cost of dental claims for the employees of the local shoe manufacturing company is normally distributed with
Prepare the appropriate journal entry to record the depreciation expense for 2012
An internal study by the Technology Services department at Lahey Electronics revealed company employees receive an average of two emails per hour. Suppose the arrival of these emails is approximated by the Poisson distribution.
You are choosing between the following investment strategies: Invest $200 in stock A. Stock A costs $20 per share. Expected yield per share of stock A is $2, and the variance of yield per share is 9 ($-squared). Which investment strategy has the hi..
perform the two anova tests. include the anova table and an explanation of your results. be sure to write full
The average monthly gasoline purchase for a family with 2 cars is 90 gallons. This statistic has a normal distribution with a standard deviation of 10 gallons. A family is chosen at random.
assume that three industrial processes a b and c are independent. if the probability of successfully working for 8
Create a real-world situation or problem that could be addressed using an independent- or related-samples t test. Create this situation or problem, that clearly identify the independent and dependent variables to study
Compare value of test statistics F obtained in part(2) with value of t 2 , square of test statistic for testing H 0 : β 1 =0 that was needed in test null hypothesis that true slope is 0. Interpret the results of this test.
an accounting firm annually monitors a certain mailing services performance. one parameter of interest is the
Compute a 95% confidence interval for the population proportion of positive drug tests. Explain why is the normality assumption not a problem despite the very small value of p.
Assumed that the standard deviation of the difference in the mean number of drinks is 6.7 drinks.
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