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1. A fitness club claims that the average age of its members is 42. Assume that the ages are normally distributed. You believe that the average age is less than 42, therefore, you ask the ages of a few of the fitness club's members and get the following values: 40, 55, 50, 33, 38, 35, 30, and 45. Do you have any reason to think the fitness club's claim is incorrect? Using you knowledge on hypothesis testing, explain your conclusion carefully with detailed procedure. Find the p-value of your test, and interpret the results.
2. Researchers will state the hypothesis they would like to confirm as alternative hypothesis, why?
3. Use the following example to explain this question, why do you only need to calculate a critical value for a simple hypothesis i.e. μ = c, even if your null is μ ≥ c or μ <= c?
Based on what we know about statistics and using your example, how do you believe statistics can enrich and represent the results of a study? How can statistics be used to misrepresent the results of a study?
In a laboratory experiment, data were gathered on the life span (Y in months) of 33 rats, units of daily protein intake (X1), and whether or not agent X2 (a proposed life extending agent) was added to the rats diet (X2 = 0 if agent X2 was not added, ..
A small company that manufactures computers computer received 10 shipments of the chips in lots of 20 chips from the manufacturer. what is the probability that there will be 2 shipments with at least one defective chip?
certain rockets are manufactured with a range of 2500 meters. it is theorized that the range will be reduced after the
provide an example of each of the following types of data nominal ordinal interval and
Select a variable. Compare the mean of the variable for a sample of 30 for one group with the mean of the variable for a sample of 30 for a second group. Use a z test.
We want to estimate the delay using the correlation analysis. Determine analytically the autocorrelation ryy(l) in terms of the autocorrelation rxx(l).
the 70-year long-term record for weather shows that for new york state the annual precipitation has a mean of 39.81
1.the st. paul pioneer press has assigned its one remaining reporter to write an article about gasoline prices in the
in one college heights of male students are approximately normally distributed with a mean of 68 inches and standard
Your company is submitting bids for two different projects, project A and project B. What is the probability of winning the bid both projects
A consumer watchdog agency selects a random sample of 40 taxpayers. What is the standard error of the mean? What is the likehood the sample mean is greater than 320 minutes?
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