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Consider the following sample data drawn independently from normally distributed populations with equal population variances. Sample 1: 12.1 11.8 7.0 12.2 9.5 9.0 9.3 10.8 Sample 2: 9.0 11.4 11.5 12.9 9.1 10.3 10.5 12.2 Construct the relevant hypotheses to test if the mean of the second population is greater than the mean of the first population. Calculate the value of the test statistic. Calculate the critical value. Interpret the results. Calculate the critical value at the 10% level of significance. Interpret the results.
A coin was flipped 60 times and came up heads 38 times. (a) At the .10 level of significance, is the coin biased toward heads? Show your decision rule and calculations. (b) Calculate a p-value and interpret it.
From her district, consisting of several hundred stores, she selects a random sample of 30 stores. For each store she gathered the following information.
Computing a linear regression equation to predict the future values of the dependent variable Y - Linear relationships into a single multiple regression.
Four cards are selected, one at a time, from a standard deck of 52 cards. Let x represent the number of aces drawn in a set of 4 cards.
Estimating the individual score using normal distribution and find the minimum SAT score needed to be accepted?
The branch manager of a pet supply store wants to study characteristics of customers of his store. In particular, he decides to focus on two variables
You are interested in determining the average cost of a 3-minute telephone call to locations within the continental U.S.
The average time it took then to change a water pump was 18 minutes. The standard deviation of the sample was 3 minutes. Find the 99% confidence interval of the true mean.
Suppose that 46 percent of families living in a certain country own a car and 18 percent own an SUV. The Addition Rule might suggest, then, that 64 percent of families own either a car or an SUV. What's wrong with that reasoning.
If a college includes a minimum score of 1050 among its requirements, what percentage of females do not satisfy that requirement?
The test grades at a large school have an approximately normal distribution with a mean of 50. What is the standard deviation of the data so that 80% of the students are within 12 points (above or below) the mean?
On a police sergeants exam, the historical mean scored was 80 with a standard deviation of 20. Four offiers scored 195,175,191, and 189 respectively
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