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Consider a test that measures adults memory skills and suppose that scores are bell shaped. You take the test and obtain a score of 254.21 and are told that you are in 96.1th percentile. Your friend also takes the test and obtains a score of 161.42 and is told that he is in the 22.8th percentile. What is overall mean and standard deviation of the test scores?
At α = 0.01, is the degree of certainty independent of credits earned?
Disney tells you that the average distance between the ears on a Mickey Mouse hat is 5 inches. In a sample of 100 Mickey Mouse hats you find that the average distance between the ears on the hats is 5.2 inches with a standard deviation of 1 inch.
A researcher uses hypothesis test to estimate H0 µ= 80. Which combination of factors is most probable to result in rejecting null hypothesis?
Assign probabilities to the sample points and then find the probability that the first envelope purchased contains less than $100.
Not take SRS of 25 students who took test. What are the mean and standard deviation of sample mean score xbar of these 25 students?
Test the claim by random sampling 60 hgh school boys. Researcher found 54 boys have a cell phone at a = 0.01. Should the claim be rejected?
What is the p-value and compute a 95% CI for the difference in means between the two groups?
Probability about 0.2 of suggesting that the person is deceptive. What is the probability that the number classified as deceptive is less than the mean?
Total housing costs as a percent of monthly income, five years ago and now. The information is reported below. Is it reasonable to conclude the percent is less now than five years ago?
In this research report you will be analysing a set of data of which can be found in an EXCEL file available for download in the Assessment section of the Blackboard site.
Suppose a simple random sample of size 42 is selected from a population with = 10. Find the value of the standard error of the mean in each of the following cases.
Explain the difference between descriptive statistics and inferential statistics with less than 50 words? Name two graphs that can be used for describing qualitative data and two for describing quantitative data. Name one graph that can be used to ..
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