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1. Write a brief summary of what you learned in this activity about how features of distributions are related to graphs of the data.
2. Name two variables that have symmetric distributions, two that have distributions skewed to the right, and two that have distributions skewed to the left.
Find the discrete probability distribution for the random variable X and compute the corresponding mean and standard deviation.
If the population standard deviation is $7, and a random sample of 50 properties is chosen, what is the probability that the sample average will be below $35?
Construct a relative frequency histogram plot for the homeownership data given in the table for the years 1985, 1996, and 2002. What major differences exist between the plots for the three years?
Is the definition of entry barriers in this chapter normative or positive? Could such an entry barrier ever be socially beneficial?
At the 5 percent level of significance, can we conclude that the mean weight is greater than 16 ounces? Determine the p-value.
If we desire batches that are 5% nonconforming to be accepted with a probability of no more than 0.04, which of the plans above would be preferable? Will the plan meet this criterion?
What proportion of 330 cci cars fall between 26 to 30 miles per gallon range? Compute the percentage of each of the car models that get 30 or more mpg.
four samples of water were taken at five different locations along a river and measurements were obtained of the amount
Assume that the samples are normally distributed with equal population variances. Refere to the sales volume data in the table below, what is the number of degree of freedom? Top Shelf Sales Volume 23 35 50 68 32 Bottom Shelf Sales Volume 55 70 72..
Compute a 95% confidence interval for the population mean, based on the sample 25, 27, 23, 24, 25, 24 and 59. Change the number from 59 to 24 and recalculate the confidence interval.
to evaluate a particular metlar scale an item whose weight is known to be 16.01 ounces is weighted five times by the
You are estimating the cost of engine overhauls a sample of 99 repairs showed an average overhaul of 285 hours with a standard deviation of 60 hours. Calculate a 95% confidence interval for the average overhaul
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