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An automobile assembly line operation has a scheduled mean completion time, mean, of 14.7 minutes. The standard deviation of completion times is 1.2 minutes. It is claimed that, under new management, the mean completion time has decreased. To test this claim, a random sample of 60 completion times under new management was taken. The sample had a mean of 14.6 minutes. Assume that the population is normally distributed.
Perform a one-tailed test.
null H0:
alternative H1:
This is a z test
The value of the test statistic is
The critical value at the 0.01 level of significance: (round to at least three decimal places)
Can we support the claim that the mean completion time has decreased under new management?
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Using a level of significance of .05, is there evidence that the dual degree students are receiving lower grades? Explain.
In a sample of 1200 police officers, the mean annual salary was $33,000 and the standard deviation was $3200. A random sample of size 70 is drawn from this population. What is the probability that the mean annual salary is between $32,000 and $32,..
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According to a well-known newspaper journal, 58.3% of the 222,900 households in particular county get the Sunday edition of local newspaper. Assume that random samples of 200 households are selected.
Suppose that you are the director of table game operations at a large casino, known especially for its poker room. You are interested in determining the average number of hands the casino should expect per hour during peak hours in the poker room.
At the level of significance, is there evidence that the population mean force is greater than 1500 pounds?
Need to come up with a regression model to forecast monthly sales of cold beverages for the next year. What variables might be included in the model?
NBC TV news, in a segment on the price of gasoline, reported last evening that the mean price nationwide is $1.50 per gallon for self-serve regular unleaded.
Provide an explanation of a chi-square test. Why would you use the chi-square statistic? What type of data is used with chi square analysis?
To sketch the 3-sigma X-bar chart and R-chart parameters. A candy bar manufacturer desires to set up a variables control chart for the net weight of its candy bars.
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