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Achievement test scores of all high schoolseniors in a certain state have a mean of 60 and a variance of 64. A random sample of 100 students from one large high school had a mean score of 58. Is there evidence to suggest that this high school is inferior?
The final grades for a random sample of MKT 380 students are as follows: What is the standard deviation for these data?
Compute a value V that enables us to state, with 90 percent confidence, that population variance (sigma^2) is less than V.
A small home-based company produces both hand-painted scarves and sweaters. The scarves take 2 hours of labor to produce, and the sweaters take 14 hours.
The Z score on the comparison distribution for the sample score, and (c) your conclusion. Assume that all populations are normally distributed.
Add line-of-best fit (trend line/linear regression line) to your scatterplot. Write down the equation of the trend line below.
If the oven gets hotter than 475 degrees F, the core is defective. What is the probability that the oven will cause a core to be defective?
Compute the pdf of continuous random variable Z where Z = X + Y and X is a continuous random variable uniformly distributed on [0, 2] and Y is a continuous random variable uniformly distributed on [0, 4]. Assume that X and Y are independent.
Assume a sample size of n=20. Draw a picture of the distribution of the t statistics under the null hypothesis. Use the t distribution critical values (upper-tail p) table.
Sketch curves representing the distribution of the original population and the sampling distribution of x for a sample of size n+16.
Cash back when they make a purchase at a shoe store. or C. an entry into a sweepstakes when they make a purchase. I need to determine the probability of each option.
Your company has experienced problems with employee morale and productivity. The consultant that was hired submits a report that includes opinions and data collected from 300 secretaries and clerks as well as 75 senior managers.
A quality control engineer selects a part to be tested. The part is then declared acceptable, repairable, or scrapped. Then another part is tested. List all the possible outcomed of this experiment.
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