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A study by the Massachusetts Com m unity & Banking Council found that blacks, and to a lesser extent, Latinos, remain largely unable to borrow money at the same interest rate as whites (The Boston Globe, February 28,2008). The following contingency table shows representative data for the city of Boston, cross-classified by race and type of interest rate received:
At the 5% significance level, do the data indicate that the interest rate received on a loan is dependent on race? Provide the details.
Compute the population standard deviation. Find an approximate mean of the sampling distribution. How do these two numbers compare?
A recent study by a large retailer designed to determine whether there was a relationship between the importance a store manager placed on advertising and the size of the store revealed the following sample information:
body mass index bmi for newborns follows a normal distribution with a mean of 14 and standard deviation of .95. a
the waiting time at a certain bank is approximately normally distributed with a mean of 3.7 min and a standard
Which of the following are random or systematic sources of error? (a) Power failure during equipment test
a microchip company has two machines that produce the chips. machine i produces 55 of the chips but 5 of its chips are
The annual commissions per salesperson employed by a retailer of mobile communication devices averaged $40,000, with a standard deviation of $5,000. What percent of the salespersons earn between $32,000 and $42,000?
does the incidence of internal or external validity show poor preparation or are these to be
A class of fourth-graders was asked to bring a pumpkin to school.- Verify that the sample mean, trimmed mean, and median are X‾= 229.2, X‾t = 220.8, and M = 221.
provide two values. for each pair of values use a percentage to express their relative change or difference. use the
a newspaper company received 14 entries in a contest. the probability of receiving a newspaper subscription order with
Suppose X¯ t = 5.1 with sw = 7 based on n = 25. Test the hypothesis that the population trimmed mean is exactly 4.8 with α = 0.01.
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