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Question - More information is needed. Refer to the previous exercise. Suppose that after reviewing the results of the previous survey, you proceeded with preliminary development of the product. Now you are at the stage where you need to decide whether or not to make a major investment to produce and market it. You will use another random sample of your customers, but now you want the margin of error to be smaller. What sample size would you use if you wanted the 95% margin of error to be 0.075 or less?
Determine equation in point-intercept form for line that goes through points (8,-1) and (4,3).
an independent-measures research study uses two samples each with n 12 participants. if the data produce a t statistic
There are 10 questions on a true-false test. A student feels unprepared for this test and randomly guesses the answer for each of these.
Refer to the alligator food choice example in Section 6.1.2. a. Using the model fit, estimate an odds ratio that describes the effect of length on primary food choice being either "invertebrate" or "other."
a how many ways are there to distribute seven identical apples and six identical pears to three distinct people such
(b) In fact, the experiment from which X and Y are derived is performed sequentially. First, X is found, then Y is found. In this context, label the conditional branch probabilities of the following tree:
The following data show the cost of electricity during August 2010 for a random sample of 50 one-bedroom apartments in a large city:
Identify the types of descriptive statistics (numerical measures) that might be best for summarizing the data, if you were to collect a sample.
What are the relevant variables? What are their measurements (think variation)? If you intend to collect your own data, include a description of your statistical design and sampling plan. If it's a survey, include the questionnaire. If you are usi..
Is inference based on t distributions nonetheless justified? Explain your answer. If t inference is justified, compare the usual t and bootstrap t 95% confidence intervals.
Refer to the simple linear regression of sweetness index y and amount of pectin x for n = 24 orange juice samples, Exercise 9.14 (p. 484).A 90% confidence interval for the mean sweetness index, E(y), for each value of x is shown on the SPSS spread..
On his return he is equally likely to enter, and leave his running shoes, either by the front or back door. If he owns a total of k pairs of running shoes, what proportion of the time does he run barefooted?
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