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The operator of a large production plant would like to estimate the mean amount of time a worker takes to assemble a new electronic component. Assume that the standard deviation of this assembly time is 3.6 minutes.
1. After observing 120 workers. The manager noticed that their average time was 16.2 minutes. Construct a 92% confidence interval for the mean assembly time.
2. How many workers should be involved in this study in order to have the mean assembly time estimated up to +/- 15 seconds with 92% confidence?
A recent national survey found that high school students watched an average (mean) of 7.5 DVDs per month with a population standard deviation of .60.
the number of lightning strikes on a square kilometer of open ground in a year has mean 6 and standard deviation 2.4.
The F-test cannot be used to answer whether or not there is a significant difference between the means.
effects of cocaine on children-researchers conducted a study to assess the effects that occur when children are exposed
Explain the difference between testing a single mean and testing the difference between two means. What two assumptions must be met when one is using z test to test differences between two means?
in a study conducted to investigate browsing activity by shoppers each shopper was initially classified as a in a study
The value of SS residual measures the average squared distance between the actual Y values and the Y values predicted by the regression equation.
The students were asked to evaluate the effectiveness of the format on an 11-point scale (1 = poor, 11 = excellent). What are the degrees of freedom associated with the test statistic?
What is the (a) Minimum number of doctors required so that at least 70% of the arriving patients can receive treatment immediately
Playbill magazine reported that the mean annual household income of it's readers is $219,155. Assume this estimate of the mean annual household is based on a sample of 91 house-holds and based on past studies,
a recent poll of 700 people who work indoors found that 278 smoke. if the researchers want to be 98 confident of their
assume that a procedure yields a binomial distribution with a trial repeated n times. use the binomial probability
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