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The table below lists the number of audience impressions (in hundreds of millions) listening to songs and the corresponding numbers of albums sold (in hundreds of thousands). The number of audience impressions is a count of the number of times people have heard the song. The table is based on data from USA Today. Does it appear that album sales are affected very strongly by the number of audience impressions?
Audience impressions - 28,13,14,24,20,18,14,24,17
Albums sold - 19,7,7,20,6,4,5,25,12
Speed of cars travelling on I-85 in Gaston County is normally distributed with average speed (µ) of 66 MPH and standard deviation (σ) of 8 MPH.
Median can be a more suitable measure of central tendency than mean if distribution of data is extremely skewed.
What is wrong with this design? What confounds could be leading to the results of improved memory and problem-solving skills?
A Starbucks manager decides to study waiting times of customers for service at the lunch time rush hour 1100-1200. He observes three customers to measure the time the customer enters the line to the time he or she reaches the counter.
A device has a sensor connected to an alarming system. The sensor triggers with probability 0.95 if dangerous conditions exist in a given day and with probability 0.005 if conditions are normal during the day. Days with dangerous conditions occur ..
For monthly volume of 300 tables, find out total cost, total revenue and profit.
Where should the warranty limits be set so that only 10 percent of the HDTVs need repairs at the manufacturer's expense?
Testing for population mean - warp-breaking specification of the manufacturer at the .05 level of significance?
A random sample of 16 ages is drawn from the population, and we find the sample mean of these observations to be μ = 8.76. What is the value of the test statistic?
If the standard deviation of the amount of coffee dispensed is 0.4oz and the amount of coffee dispensed is normally distributed.
ABC Corp. is a firm with all-equity financing. Its equity beta is .80. The Treasury bill rate is 4 per cent and, and the market risk premium is expected to be 10 per cent. What is ABC's asset(equity) beta?
Test at 5% significance level null hypothesis that population mean is 40 hours against alternative that it is higher.
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