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In a recent survey, participants were asked which Apple products influenced them the most.
ipod iphone ipad total
Age under 20 70 100 130 300
Age 20-40 160 140 90 390
Age over 40 190 110 50 350
Total 420 350 270 1040
1. What is the probability that the participant was aged 20-40 or was influenced by ipad the most?
2. What is the probability that the participants were influenced by ipod the most, given that the participants are aged under 20?
Design a 95 percent confidence interval for the proportion of defectives in a large lot, if a sample of 200 showed 12 defectives.
Construct a 99% confidence interval for the difference between the true average boot times of the two types of hard drives. Assume the difference will represent (HDD-SSD) and that the population standard deviations are statistically the same.
Identify the null and alternative hypothesis, test statistics, p-value or critical value(s), conclusion about the null hypotesis and final conclusion that address the original claim.
You construct a 90% confidence interval for the average stock price to be (267.348, 279.472). Of the following choices, what is the approporiate interpretation of this interval?
Explain the difference between a discrete and a continuous random variable. Give two examples of each type of random variable.
In rectangular coordinate system, determine the distance between the points (-4,1) and (8,6).
Find a 95% confidence interval for the proportion p of the inner-city, working-class group who eventually became alcoholics.
The data represents the closing value of the Dow Jones Industrial Average (DJIA) over the 29-year period from 1979 to 2007.
Ryan is planning to finance her college education by selling programs at the football games for her team. there is a fixed cost of $400 for printing these programs, and the variable cost is $3.
Could you explain the Pearson or product-moment correlation? If we were to use a partial correlation, would you want to look at the relationship between two variables while removing the effect of one or two other variables?
A random sample of 12 paired observations indicated a correlation of .32. Can we conclude that the correlation in the population is greater than zero? Use the .05 significance level.
There're several advantages of using a paired t-test. Since the same subjects are being tested in each of the varying conditions, those subjects serve as their own control.
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