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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.
Determine the probability that sample mean is between 7.5 and 8 minutes?
Explain your answer to someone who is familiar with the t test for a single sample, but not with the t test for independent means.
When using past data, I have found that the proportion of items rejected by quality control personnel is about 3%. We normally make 5000 items per day. For a p chart, what are the upper and lower control limits?
Dinner B which costs $135.30 for dinner submitted by salesperson with mean cost of $117.50 and standard deviation of $30 per dinner?
Calculate a 3-month moving average forecast for months 4 through 9 also Compare the two forecasts by utilizing MAD. Which forecast appears to be more accurate.
Suppose the population standard deviations are not the same. At.05 significance level, is there a difference in mean waiting time?
Obtain a test statistic and p -value assuming equal variances. Interpret these results.
Create a 95% confidence interval for mean cost of repairs. Interpret this interval.
Test either there is any difference among the given variable also what does the Levene's Test shows. What variable is presented in this table.
Researcher asked group of 30 students - 12 of them supported change, 13 of them didn't, and 5 had no opinion. This is not binomial model as?
Which combination of factors produces smallest risk of Type I error?
For a two-tailed test of hypothesis (.01 significance level) to determine if there is a difference in the population means, the degrees of freedom are
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