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Question 1: In a sample of 150 auto occupants, 86% wore seatbelts. In a sample of 200 truck occupants, 74% wore seatbelts. At "alpha" = 0.10, is there sufficient evidence to reject the claim that there is no difference in these proportions?
Question 2: Find the 90% confidence interval for the true difference in proportions for the data in problem above.
Question 3: Marty claims that the standard deviation of the weights of pre - 1964 quarters is the same as that for post - 1964 quarters. The standard deviation for 40 pre-1964 quarters is 0.08700 grams and for 40 post-1964 quarters it is 0.06194 grams. At "alpha" = 0.05, can we reject Marty's claim?
Is there enough evidence to believe that the average credit card debt has increased? Use a=0.05. Give a possible reason as to why or why not the debt was increased.
In other words, both variables have the same mean but different standard deviations. Draw rough sketches of the two normal curves on the same graph.
The results shown below are mean productivity measurements (average number of assemblies completed per hour) for a random sample of workers at each of three plants.
Assuming that a hypothesis test of the claim has been conducted and that the conclusion is to reject the null hypothesis, state the conclusion in nontechnical terms.
A researcher conducts an experiment comparing two treatment conditions and obtains data with 10 scores for each treatment condition.
The two cars drove a combined total of 1450 miles, and the sum of their fuel efficiencies was 40 miles per gallon. What were the fuel efficiencies of each of the cars that week?
Normal distribution or a t-distribution should be used or whether neither of these can be used to construct a confidence interval. Assume the distribution of prices is skewed left.
You are running a chi-squared test. You have 2 groups with 3 characteristics each, what would your critical value be with an alpha of .025?
assuming all sex distributions to be equally probable what proportion of families with exactly six children should be
A student is taking a 10 question multiple choice quiz. There are four possible answers to each question. The student decides to guess at random on all 10 questions.
Use appropriate Excel functions to solve the following questions: Compute the probability of receiving four calls in a five-minute interval of time.
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.
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