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Would this be a T-value distribution? Can you take me through the steps to determine upper and lower limits of a 95% confidence interval?
Most water treatment facilities monitor the quality of their drinking water on an hourly basis. One variable monitored is pH, which measures the degree of alkalinity or acidity in the water. A target pH level is 8.5. pH values below 8.5 is acidic and above 8.5 is alkaline, both of which are bad for health. A random sample of 20 measurements resulted in an average pH of 8.55 with a standard deviation of 0.28.
Given the following frequency distribution, find out the mean, variance, and standard deviation.
Sixty percent of the families in a certain community own their own car, thirty percent own their own homes, and twenty percent own both their own home and own car. If a family in the community is randomly chosen, what is the probability that they ..
A researcher used stepwise regression to create regression models to predict BirthRate (births per 1,000) using five predictors
An independent-measures research study was used to compare two treatment conditions with n = 4 participants in each treatment. The first treatment had a mean of M = 58 with a variance of s^2 = 28, and the second treatment had M = 52 with s^2 = 36.
a) Set up the null and alternative hypotheses, and perform the hypothesis test. b) Does the jury selection system appear to be fair?
A) Describe the term population. B) Describe the term random sample. C) What is the difference between a population and a random sample?
A researcher has been hired by a pizzeria to determine which type of crust customers prefer. The restaurant offers three types of crust: hand tossed, thick, and thin.
What's the expected value of sample information? How much might the physicians be willing to pay for a market study?
In a sample of 55 mice, a biologist found that 42% were able to run a maze in 30 second or less. Find the 90% limit for the population proportion of mice who can run a maze in 30 second or less.
Determine the estimated population mean?
Final scores averaged 66 for the treatment group; the SD was 21. For the control group, the figures were 59 and 20. What do you conclude?
In the last municipal election, a sample of 350 registered voters showed that 85 voted for the incumbants. Find out a 98% confidence interval estimate for the proportion of all voters voting for the incumbants.
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