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A study of n=50 hospital employees found that the number of latex gloves used per week by the sampled workers is summarized by x = 23.1 and s = 12.5. Let μ represent the mean number of latex gloves used per week by all hospital employees. Consider testing H0: μ= 27 vs Ha: μ<27 at a level of significance of 0.01
a. Calculate the value of the test statistic.
b. Calculate the observed significance level
c. Use the results, part a and b, to make the appropriate conclusion, in words of the problem
At α = .05 in a left-sided test, find the β risk and power assuming that the true mean is really 380 square feet per gallon. (b) Construct a left-sided power curve, using increments of 5 square feet (400, 395, 390, 385, 380).
Choose the most reasonable measurement. Tyrell read the nutrition label on the back of his frozen dinner. Choose the most reasonable estimate for the amount of sodium in the dinner.
If the city manager knows the average salary nationally is $38,300, which test of significance should be used? Why?
Electricity is commonly traded at the California-Oregon border (COB) and Palo Verde (PV) in Arizona. Assume you take a sample of 100 daily electricity market closing prices (in $/megawatthour) from both COB and PV.
Four properties are randomly selected from each neighborhood and the ratios recorded for each as follows:
Determine 80% confidence interval for average weights of Allen's hummingbirds in study regions. Determine the margin of error?
To determine the possible effect of a chemical treatment on the rate of seed germination, 300 chemically treated seeds and 250 untreated seeds were sown.
The lengths of pins produced by a machine follow a normal distribution with mean 2.54 cm and standard derivation 0.04 cm.
If another sample of 1000 companies is taken, do you expect the sample mean to be 7.2 again? Why or why not? Repeating this experiment many times with different samples.
Estimating the individual score using normal distribution - blood pressure higher than what amount?
Suppose the salary of assembly line workers has Normal distribution with mean of $20,000, and standard deviation of $3,000.
Find the standard error of the mean. Also establish an interval estimate around the sample mean using one standard deviation of the mean.
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