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We are doing a study on shampoo buyers in Walmart stores across the US and we send them online surveys. Based on past studies, we know that of the people who start the survey, 80% qualify for the study, and only 40% of these people who do qualify actually complete the survey. Of the people who complete the survey, 10% of respondents are removed due to invalid or low quality answers. If we want 1000 valid responses for this particular study, how many people do we need to have start the survey?
Locate the data set "Bank.sav" and open it with SPSS. Follow the steps in section 10.15 Learning Activity as written. Answer all of the questions in the activity based on your observations of the SPSS output. Type your answers into a Word docum..
In a city, 65% of people drink coffee, 50% drink tea, and 25% both. What is the probability that a person chosen at random will drink at least one of coffee or tea? Will drink neither?
An instructor claims the average time to take a statistics test is greater than 39 min. As, if a sample of 33 students took 43 min. is the instructor's claim true?
The euro. Shortly after the introduction of the euro coin in Belgium, newspapers around the world published articles claiming the coin is biased.
Let = the sample mean of the 100 scores from University X, and = the sample mean of the 100 scores from University Y. What is the probability that will x be greater than y?
according to a recent survey about 33 of americans polled said that they would likely purchase reusable cloth bags for
An environmental service reported that a sample of 15 wild horses had a mean weight of 915 pounds with a sample standard deviation of 58 pounds. Calculate the margin of error, E, for a 99% confidence interval for the population mean weight µ of al..
What is the probability of rolling a total of 7 in two rolls of a standard dice if you get an even number on the first roll?
How hot is the air in the top (crown) of a hot air balloon? Information from Ballooning: The Complete Guide to Riding the Winds, by Wirth and Young (Random House), claims that the air in the crown should be an average of 100°C for a balloon to be ..
A random sample of 12 batteries yields X-bar = 34.2 hours and s = 5.9 hours. Give a 95% confidence interval for the average life of a battery.
For a sample of n subjects, the relative frequencies are f0/n = .2, f1/n = .4, f2/n = .2, f3/n = .15, and f4/n = .05. The sample mean is 1.45. Using your answer to given Exercise, verify that the sample variance is 1.25.
suppose iq scores were obtained from randomly selected couples. for 20 such pairs of people the linear correlation
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