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A national grocer's magazine reports the typical shopper spends six minutes in line waiting to check out. A sample of 16 shoppers at the local Farmer Jack's showed a mean of 5.1 minutes with a standard deviation of 2.8 minutes.Is the waiting time at the local Farmer Jack's less than that reported in the national magazine?Use the 0.02 significance level.
(a) What is the decision rule? (Negative amount should be indicated by a minus sign. Round your answer to 3 decimal places.)
Reject H0: µ ≥ 6 and fail to reject H1: µ < 6 when the test statistic is .
(b) The value of the test statistic is . (Negative amount should be indicated by a minus sign. Round your answer to 2 decimal places.)
(c) What is your decision regarding H0?
Determine the 95% confidence interval for true percent of car owners in this city who received the speeding ticket this year. Explain your results to nearest hundredth of percent.
For the preceding problem you should find that there are significant differences among the three treatments. One reason for the significance is that the sample variances are small.
The J.O. supplies company buys calculators the probability of a defective calculator is 10%. If 100 calculators are selected at random, what is the expected number of defective?
What is the appropriate inferential statistical test for the case scenario? Why?
What size sample would be required to estimate the proportion of unemployed college students if we want the margin of error not to exceed 3 percent?
If you have a population that has a small sample, but does not meet all of the criteria for the nonparametric test how can you tell what test to use?
A clinical study was performed to determine if a product was effective in alleviating side effects caused by a mode of treatment. In the treated group (100 subjects) it was found that 10% had side effect A, 15% had side effect B and 65% had side eff..
The weekly salaries one year after graduation are normally distributed with a standard deviation of $85. If one graduate is randomly selected. Describe the distribution of the weekly salaries being earned one year after graduation.
There are k types of distinct postcards. How many ways are there to send these postcards to n friends? (Each friend can get zero cards, also multiple copies of the same card.)
Which of the given properties doesn't apply to theoretical normal distribution?
A survey of n = 703 randomly selected workers showed that 61% of those respondents found their jobs through networking.
A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of µ = 80 and a standard deviation of σ = 20. The researcher expects a 12 point treatment effect and plans to use a ..
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