The F test statistic for testing whether the variances of two populations are the same is always positive.
Indicate whether the statement is true or false
Q. 2A first step in testing whether two populations have the same mean value using the t-distribution is to use the chi-square distribution to test whether the populations have equal variances.
Indicate whether the statement is true or false
Q. 3Suppose a study estimated the population mean for a variable of interest using a 99 confidence interval.
If the width of the estimated confidence interval (the difference between the upper limit and the lower limit) is 600 and the sample size used in estimating the mean is 1,000, what is the population standard deviation?A) 26711.14
B) 2451.23
C) 3684.21
D) 5125.11
Q. 4Micron Technology has sales offices located in four cities: Dallas, Seattle, Boston, and Los Angeles. An analysis of the company's accounts receivables reveals the number of overdue invoices by days, as shown here.
Days Overdue Dallas Seattle Boston Los Angeles
Under 30 days 137 122 198 287
30-60 days 85 46 76 109
61-90 days 33 27 55 48
Over 90 days 18 32 45 66
Assume the invoices are stored and managed from a central database.
What is the probability that a randomly selected invoice from the database is from the Boston sales office?
A) 0.2702
B) 0.0231
C) 0.3461
D) 0.7765
Q. 5If a scatter diagram shows points that are reasonably aligned and are sloping downward from left to right, this implies that there is a negative linear relationship between the two variables.
Indicate whether the statement is true or false
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