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The annual turnover rate of the 200-count bottle of aspirin follows the normal distribution with a mean of 6.0 and a standard deviation of 0.50. (This indicates that the stock of asprin turns over on the pharmacy shelves an average of 6 times per year.) It is suspected that the mean turnover has changed and is not 6.0. Use the .05 significance level.
Give the formula for the test statistic.
Suppose that n trials of a binomial experiment result in no successes.
Find out a 95% confidence interval for the proportion p of adults who have a great deal of trust and confidence in the executive branch of government.
Use simple exponential smoothing with α = 0.33 to forecast battery sales for February through May. Assume that the forecast for January was for 22 set of tires.
Report descriptive statistics, assumptions tests, effect sizes (partial eta) as well as tests of statistical significance.
Rank the funds by using this alternative measure of risk. Which, if any outperformed the market on the risk-adjusted basis.
Create a scatter plot for those data. Based on scatter plot, how would you explain relationship between the two variable.
Find out the probability distribution of your net winnings if you play one time. Calculate the mean and the standard deviation.
Conduct post hoc comparisons with the LSD method. Which groups differ significantly at α = 0.05?
If we know that 20 people will attend, what price should be charged per person to break even?
Generate descriptive statistics. Create a stem-and-leaf plot of the data and box plot of the data.
Is it reasonable for the manufacturer to claim that the drill bits will last 2.5 hours?
Using a critical value, test hypothesis at the 1% level of significance.
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