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A random sample of 10 shipments of stick-on labels showed the following order sizes. (a) Construct a 95 percent confidence interval for the true mean order size. (b) How could the confidence interval be made narrower? (c) Do you think the population is normal? (Data are from a project by MBA student Henry Olthof, Jr.) OrderSize 12,000 18,000 30,000 60,000 14,000 10,500 52,000 14,000 15,700 19,000
The "Top Three" at a racetrack consists of picking the correct order of the first three horses in a race. If there are 10 horses in a particular race, how many "Top Three" outcomes are there?
School seniors in his random sample, 159 believe that "getting rich" is an important goal. Can he conclude, at the 0.05 level of significance, that the proportion has indeed changed?
Two servers with lambda 1 & lambda 2 service times exponentially distributed. Pat waits in a line to get served by any of the two servers. What is the waiting time of pat if no one is on the line?
With a sample standard deviation of 33 miles. At the 0.05 level of significance is there a difference in the mean number of miles traveled between the two groups?
Explain the overall statistical significance of the model, Explain the statistical significance for each independent variable in the model
Explain how one extreme score influences mean and standard deviation.
A researcher claims that the average age of people who buy lottery tickets is 64. A sample of 30 is selected and their ages are recorded as shown below.
The percentages of cones sales for chocolate, strawberry, and vanilla, are 75%, 60%, and 40%, respectively. For a randomly selected sale, define the following events:
Perception of Time- Randomly selected statistics students of the author participated in and experiment to test their ability to determine when 1 min(or 60 seconds) has passed.
Descriptive statistic results from quarterly sales figures over a 18 year period (73 qtr) are below. Please interpret the standard Deviation and Median in terms of sales results,
How many cans of paint should the sample contain if the researcher wants to be 98% certain of being within one percentage point of the true proportion of this chemical?
Sketch the distribution of sample means for sample of n = 25 scores from this population.
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