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"How much do you plan to spend for gifts this holiday season?" An interviewer asks this question of 250 customers at a large shopping mall. The sample mean of the responses is $237. Assume that $65. A 99% confidence interval for the mean gift spending of all adults was computed to be ($226.4, $247.6). This confidence interval can't be trusted to give information about the spending plans of all adults. Why not?
Draw the OC curve. If the average number of defects increased by to 10 per tractor, what would the probability of detecting the shift in a control chart?
Construct ogive cure and numerical measures for the discrete data.
A researcher selects a random example of college students and measures number of hours they spend watching television per week and their grade point average.
A sustained long-term change in the level of the variable that is being forecasted per unit of time is: (A trend, A time series, Seasonality or A change due to business cycles)
Construct a 95% confidence interval estimate for the proportion of all workers who did not use the Internet within limits. Explain your findings so that your non-quantitative partner will understand them.
The mean of a normal probability distribution is 60; the standard deviation is 5.
If we were to ask three people at arbitrary, determine the probability that they will all prefer punk rock?
Determine what analysis would you do on each problem (i.e., one-sample z-test, one-sample t-test, proportion test, two-sample independent t-test, or paired test)?
Test whether the mean rate is less than 6%. Use P-value approach.
A property of concern for any food company that uses a high-speed carton-filling machine to package juice is the weight of the food product in the individual cartons.
Finding the probability of each event in a group of events of different possibility
Find a 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
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