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For each scenario below, what is the appropriate statistical analysis to use? (t-test for two independent samples, t-test for dependent samples, ANOVA, or chi-square test of independence) and why?
(a) A study was conducted to see whether monetary incentives to use less water during times of drought had an effect on water usage. Sixty single family homeowners were randomly assigned to one of two groups: 1) monetary incentives and 2) no monetary incentives. At the end of three months, the total amount of water usage for each household, in gallons, was measured.
(b) A study was conducted to see whether the mean weight loss is the same for 10 different weight loss programs. Each of the 10 programs had 50 subjects in it. The subjects were followed for 12 months. Weight change for each subject was recorded.
The distance is recorded for each hit, and the results are shown below, organized by brand. Carry out a complete analysis using ANOVA and a 5% significance level.
Do air carriers have economies of scale at any level? Economies of density ? Discuss and support your answer with examples.
the bekaert company of belgium is a major supplier of bead wire for tire re-enforcement and other specialized wire
Estimate the indicated probability by using the normal distribution as an approximation to the binomial distribution.
Horse pregnancies. Bigger animals tend to carry their young longer before birth. The length of horse pregnancies from conception to birth varies.
14 machines are planned to be used for a 60-day production run for a customer. The operating time is 1660 hours. Upon failure, a machine must be returned to the manufacturer for repair.
The National Association of Realtors Existing-Home Sales Series provides a measurement of the residential real estate market. One of the measurements it produces is the Housing Affordability Index (HAI), which is a measure of the financial ability..
What is the expected number of visits given that a patient has had at least one visit?
The U.S. Food and Drug Administration (FDA) performed a study that compared the carbohydrate content (as a percentage of weight) of several major brands of corn and potato chips.
A restaurant manager is interested in taking a more statistical approach to predicting customer load. She begins the process by gathering data.
Scientist does n ot believe that water ph is 7. She wants to test the null hypothesis that the true level of ph is 7 at the .05 significance level. Her alternative hypothesis is that the water does not have a ph of 7. Which p-value will she reject..
How much will Rachel have to pay Sally per year over the next five years to take over the lemonade stand?
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