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1. Construct stem-and-leaf and dotplot displays based on the investment portfolio values in the data file (XR02017) for Exercise 2.17.
2. Construct stem-and-leaf and dotplot displays based on the access times in the data file (XR02018) for Exercise 2.18.
3. Construct stem-and-leaf and dotplot displays based on the e-mail receipts in the data file (XR02019) for Exercise 2.19.
4. City tax officials have just finished appraising 60 homes near the downtown area. The appraisals (in thousands of dollars) are contained in data file XR02027. Construct stem-and-leaf and dotplot displays describing the appraisal data.
5. The manufacturer of a water-resistant watch has tested 80 of the watches by submerging each one until its protective seal leaked. The depths (in meters) just prior to failure are contained in data file XR02028. Construct stem-and-leaf and dotplot displays for these data.
Note: These graphs and charts can be done by hand, but, if possible, use the computer and your statistical software.
A normal population has a mean of 75 and a standard deviation of 5. You select a sample of 40. Compute the probability the sample mean is:
Their mean monthly sales were $10,000 with a standard deviation of $1000. Construct a 95% confidence interval for the population mean.
sample surveys conducted in a large county in a certain year and again 20 years later showed that originally the
What are the critical values for z on a one-tailed test if alpha = .01? .001? What would the critical values be at both levels of significance if it was a two-tailed test?
1.a manufacturer of infant formula is running an experiment using the standard control formula and two new formulas a
the critical value z used for constructing a 96 confidence interval for a population mean micro isa. 1.645.b. 2.054.c.
The error between the sample mean and the population mean for a sample of n = 16 is 5 points and the error between a sample men and population mean for a sample of n = 100 is 2 points. Explain the difference in the standard error??
Use formula z=(mean of values in sample - mu subscript mean of values in sample) divided by (lower case sigma divided by sqrt number of values in sample)
A Variable has a mean of 100 and a standard deviation of 16. Four observations of this variable have a mean of 108 and a sample standard deviation of 12. Test whether the sample has been drawn from the population.
an analyst must decide between two different forecasting techniques for weekly sales of roller blades a linear
Employ a four period moving average and determine the forecasted demand for August. Put your answer in the form xx.x with no additional numbers or symbols.
The Gray Stone Rock Band will give 10 performances this season.Four of these will be only songs from the 70s. If Tony gets to pick two tickets at random, what is the probability that he will get both 70s tickets?
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