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A psychologist studied self-esteem scores and found the data set to be normally distributed with a mean of 50 and a standard deviation of 6.
A raw score of 47 is associated with what percentile?What are the z-scores that mark the middle 95% of this distribution?What is the median of this distribution?
The thickness of metal plates made by a particular machine are normally distributed with mean of 4.3 mm and standard deviation of .0.12 mm. What is the value of c for which there is 80% probability that a metal plate has a thickness with in the in..
A nationwide real estate company claims that its average time to sell a home is 57 days. Suppose it is known that the standard deviation of selling times is 12.3 days and that selling times are normally distributed.
At the .05 level of significance, is there convincing evidence that the number of absences per employee has increased?
Your company manufactures low calorie frozen dinners. The advertised calorie content is 200 calories. A consumer activist group, FACT: fat and calories tribunal, is claiming that your product is not consistent.
For a hypothesis comparing two population means, what is the critical value for a one-tailed hypothesis test, using a 5% level of significance level, with both sample sizes equal to 13? Assume the population standard deviations are equal.
You may assume the sample data comes from a population that follows a normal distribution. Using a .05 level of significance test the company's claim.
Although the rules of probability are just basic facts about percents or proportions, we need to be able to use the language of events and their probabilities.
Give 99% confidence interval for mean number of years general managers of major-chain hotels have spent with their current company.
There are three versions of a board game released - version 1, version 2, and version 3. The versions are distributed equally and evenly among all potential sellers of board games.
The mean and variance of the total amount of money that is collected from a car that crosses the bridge are:
Write a paragraph summarizing the results of the analysis and determine whether the calculated values of chi-square are statistically significant
Claculate the exponential also adjusted exponential smoothing forecast and linear trend forecasting. The hotel has experienced the following occupancy rates for the past 9 years.
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