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Suppose the population of IQ scores in the town or city where you live is bell-shaped, with a mean of 105 and a standard deviation of 15. Describe the distribution of possible sample means that would result from random samples of 100 IQ scores.
Find a 98% confidence interval for the true proportion of students who have a personal blog with a maximum margin of error of 0.03. How many students do you survey?
Describe a recent study where data was gathered. If possible, explain whether it is a qualitative or quantitative study, and whether the data is discrete or continuous. What type of graph would you use to describe the data and why?
Surveys of political opinion typically use a quota sample of 1000 voters with a new sample being selected each time. In the period before a general election, some organizations use panels. Suggest reasons for using a panel in preference to the mor..
Explain how fonts or formats might incorrectly be used to represent information, and give an alternative way of representing that same information that would be suitable for analysis by IBM SPSS.
Whether or not the student procrastinates in doing assignments; confounding variable = number of hours per week the student spends socializing.
(a) Show that this second probability statement can be written as Pr (nS2/b tr nS2/a) = 0.95. (b) If n = 9 and s2 = 7.63, find a 95 percent confidence interval for u2.
b. Force the regression line through the origin. What is the new regression equation? Predict Y when X 10 with this equation.
Supposes that the diameter of bearings are independent normally distributed random variables with mean µB = 1.005cm and variance σ²B = (0.003)² cm² . The diameter of shafts are independent normally distributed random variables having mean µB = 0.9..
Would the mean of 7.1 hours of sleep obtained from the statistics students be a reasonable value to expect for the sample mean of a random sample of 190 adults? Explain.
He selects two cards from the pile. The probability that the first cards is a king is then the probability the If the first card is a king, the second is also a king?
After you meet with Kathy, she still refuses to attend the classes, so you decide to provide her with a pamphlet that will provide education on pregnancy self-care and newborn care essentials.
The following data represent the number of colour television sets manufactured each day at a given factory, for a random sample of 15 days.
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