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1. See the 2 by 2 table. Say the context is that on a Saturday a store has 85 customers who ask a sales rep about a particular product. In the table you see a breakdown of those who had not seen an advertisement for the product and those who had and those who did not or did make a purchase.
Had not seen ad Y1 Saw ad Y2Did not purchase X1 4 13Made purchase X2 16 52
P(X2 Y1) =P(X1 or Y2) =P(X1 given Y2) =
While it seems that seeing the ad generated a great deal of traffic, is the notion of making a purchase independent or dependent on the idea of seeing the ad? Explain your answer.
2. All bags entering a research facility are screened. Ninety-seven percent of the bags that contain forbidden material trigger an alarm. Fifteen percent of the bags that do not contain forbidden material also trigger the alarm. If 1 out of every 1,000 bags entering the building contains forbidden material, what is the probability that a bag that triggers the alarm will actually contain forbidden material?a. 0.00097b. 0.00640c. 0.03000d. 0.14550e. 0.97000
it is estimated that .54 percent of the callers to the customer service department of dellinc. will recieve a busy
magic valley memorial hospital administrators have recently received an internal audit report that indicates that 15 of
to test h0 versus h2 a simple random sample of size n 15 is obtained from a population that is known to be normally
from these data estimate the average height of all adults and calculate a bound on the error of estimation assume that
question a study is conducted comparing hdl cholesterol levels between men who exercise regularly and those who do
Which of these variables are discrete and which are continuous random variables?
What is the probability of losing at the first toss? If the first toss is 4, what is the probability of winning on the next toss? What is the probability of winning at the first toss of the dice?
For instance, one busy Midtown Manhattan center had a peak arrival rate of 172 customers per hour. A multiple-channel waiting line model with six ATMs showed that 88% of the customers would have to wait, with an average wait time between 6 and 7 m..
Based on this sample information find out what percent of variation in starting salaries is described by GPA, and find out the equation that would forecast salary from GPA. Give a scatter plot.
Is the effect of the medicine significant at the 5 percent level?
The following frequency table lists the sales of an item and the number of times it has occurred. It was obtained from historical records. Sales/Frequency: 10/100, 15/120, 20/300, 25/350, 30/400, 35/500, 40/300, 45/170.
Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern.
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