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A survey of the number of calls received by a sample of Southern Phone Company subscribers last week revealed the following information.
52 43 30 38 30 42 12 46 39 37 34 46 32 18 41 5
a) Develop a stem-and-leaf chart. Above for tips on presenting Stem-Leaf plot.
b) What basic conclusions can be drawn from this chart?
c) Compute the 5 number System for this data set and list Xmin,Q1,Q2,Q3 & Xmax. See Videos and show how the pointer was computed for each quartile.
By using the fact that Martha believes the treatment will decrease the amount of time to fall asleep, describe the null and alternate hypotheses.
A recent study of 75 workers found that 53 people rode the bus to work each day. Find the 95 percent confidence interval of the proportion of all workers who rode the bus to work.
Develop a linear regression equation for the given data and forecast how much money Robert will win if he spends $30.
What would be your best point estimate for average Sales in weeks for which Newspaper advertising were $1 million? What would be an appropriate interval estimate for this?
Stating assumptions on which your arguments and conclusions are based, sum up the statistical evidence regarding effectiveness of this diet.
Thirty-two samples of 8 items each were collected from a process. The average sample mean is 12 and the average range is 0.10.
Evaluate true mean delivery time to within 5 minutes at 90% reliability level? Suppose that standard deviation for delivery times is 18.2 minutes.
A scientist examined the effect of temperature and catalyst on the yield of a reaction. He ran the experiment at both 150° and 200°C with two types of catalyst.
The use of linear regression is a critical tool for a manager's decision-making ability. Please carefully read the example below and try to answer the questions in terms of the problem context.
Perform a parametric analysis by assessing the fractional change in the probability of failure with respect to a small change in the mean and standard deviation of selected variable.
Construct a 95 percent confidence interval for the true mean.
Use the binomial distribution formula to calculate the probability that:
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