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A marketing research company needs to estimate which of two soft drinks college students prefer. A random sample of n college students produced the following 98% confidence interval for the proportion of college students who prefer drink A: (0.384, 0.424). Identify the point estimate for estimating the true proportion of college students who prefer that drink.
Critically discuss the purpose of developing a frequency distribution? What is the relationship between the relative frequency and the cumulative frequency? Could a frequency distribution contain qualitative data? Why?
The null hypothesis is to be tested at 95% confidence. Determine the critical values for this test.
Be sure the appropriate assumptions and conditions are satisfied before you proceed.
Show that theta~ = u(X) is an unbiased estimator of theta, where u(0) = 1 and u(x) = 0 if x =1,2, ... Compare the MSEs of theta(hat) and theta~ for estimating theta = e^(-m) when m=1 and m=2
The American Bankers Association collects data on the use of credit cards, debit cards, personal checks, and cash when consumers pay for in-store purchases (The Wall Street Journal, December 16, 2003). In 1999, the following usages were reported.
An automotive manufacture claims mean price of small SUV is $25,071 if hypothesis test is performed how you should interpret a decision,
The standard deviation of the population is 1 at a-0.05, is the number of sticks of gum a person chews per day actually greater that 8?
How large a sample would be necessary to estimate the population proportion with a margin of error of 0.05 at 95% confidence?
A retail store manager is trying to estimate the average purchase transaction amount for a particular store. She takes a sample of 35 transactions and determines the mean purchase transaction amount from this same is $85 with a standard deviation ..
Determine whether the sampling method is independent or dependent for the following example. A researcher wants to know whether the newly issued "state" quarters have a mean weight that is different from "traditional" quarters.
Develop mathematical functions that compute the annual ordering cost and annual holding cost based on average inventory held throughout the year in order to arrive at a model for total cost.
Write out expressions for all sums of squares (in terms of the temperatures yijk m , using the dot-and-bar notation), including the (corrected) total sum of squares and error sum of squares.
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