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A poll found that 38% of male voters and 46% of female voters support a particular candidate. To test whether this candidate has equal levels of support between male and female voters, the null hypothesis should be:
a) H0 : pmale =pfemale
b) H0 : pmale =50 % , H0 : pfemale= 50 %
c) H0 : pmale =38 % , H0 : pfemale= 46 %
d) H0 : pmale <pfemale
A traffic study at one point on an interstate highway shows that vehicle speeds are normally distributed with a mean of 61.3 mph and a standard deviation of 3.3 mph.
Suppose that population has normal distribution. Determine a 95 percent confidence interval for population standard deviation sigma.
The mean number of passengers per flight is 160 with a standard deviation of 20. The aircraft used for the route has 200 seats.
Suppose a researcher has trained observers to rank participants according to their level of frustration when trying to solve a puzzle.
For a recent year, the mean fare to fly from Charlotte, North Carolina, to Seattle, Washington, on a discount ticket was $267. A random sample of round-trip discount fares on this route last month gives:
Compare and contrast random selection and random assignment. Be sure to include a discussion of when you would want to do one or the other and the possible consequences of failing to do random selection or random assignment in particular situation..
A doctor believes that the standard deviation of systolic blood pressure is 450. A random sample of 24 patients found a standard deviation of 520. Assume the variable is normally distributed and a = 0.01. What are the critical values?
The weight of a small Starbucks coffee is a normally distributed random variable with a mean of 370 grams and a standard deviation of 15 grams. Find the weight that corresponds to each event:
Harry and Melissa Jacobson produce handcrafted furniture in a workshop on their farm. They have obtained a load of 600 board feet of birch from a neighbour and are preparation to produce round kitchen tables and ladder-back chairs during the next ..
The number of passengers on the Carnival Sensation during one-week cruises in the Caribbean follows the normal distribution.
Markets can be segmented by the following variables: geographic, demographic, social, or behavior. If you were to select a segmentation variable suited best for the motorcycle market, which variable would you select?
Provide a 99% confidence interval for the population proportion of college students who worked to pay for tuition and living expenses.
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