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1. A total of 75 nursing students take a professional board preparation course, and 65 other nursing students study on their own. Which test could be used to reveal which group had the higher board scores, assuming the board scores were normally distributed?
2. Which test could be used to determine the difference in the average number of times in a month people exercise before and after a 3-hour exercise orientation program? There were 50 people in the sample, and the number of times people exercised was not normally distributed.
a researcher is investigating the relationship between living near powerlines and prevalence of cancer in a certain
an article recommended the following estimated regression equation for relating y vo2max lmin a measure of
Suppose that a statistic U has a probability density function that is positive over the interval a ≤ u ≤ b and suppose that the density depends on a parameter θ that can range over the interval α1 ≤ θ ≤ α2.
A market researcher wants to find the 99% Confidence Interval for the average number of hours people spend online each day.
Use the Simple Random Sample applet to select a sample of 2 items from a population that contains the numbers 1, 2, 3, and 4. Repeat the process 20 times and record the number of times that a 3 is selected in the sample.
Jacquemyn et al. (A-21) conducted a survey among gynecologists-obstetricians in the Flanders region and obtained 295 responses.
Is there any evidence to suggest that the mean amount of protein is different in these two products? Use a = 0.01 and assume normality.
a 90 confidence interval for the difference between the means of two independent populations with unknown population
Assume that the process is in control and that the population of all jar fills is normally distributed.
When the health department tested private wells in a county for two impurities commonly found in drinking water, it found that 20% of the wells had neither impurity, 40% had impurity A, and 50% had impurity B. (Obviously, some had both impurities...
A random sample of statistics students were asked to estimate the total number of hours they spend watching television in an average week.
suppose the probability of a bike getting stolen in honolulu is 10 and 22 bikes are randomly selected in honolulu.1
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