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A normal distribution has a mean of 33 and a standard deviation of 5. Find the probability that a randomly selected x-value from the distribution is in the given interval. Between 29 and 37.
Test the hypotheses that the average household income in the township is greater than $100,000. Hint: Start by stating the null and alternative hypotheses.
Dr Johnson wants to know if there is sufficient evidence to conclude that the grade distribution of his class is different than the historical grade distribution.
A health researcher is interested in determining whether or not the speed at which people walk is related to their cholesterol levels. He picks 100 adult volunteers at random, checks their cholesterol levels, and then times each one while they wal..
A sample of 25 provided a sample mean of 14 and a sample standard deviation of 4.32. What is the value of "t" for this sample? For a 95% confidence level, what is the critical value of "t"?
A survey was conducted to measure the height of men. In the survey, respondents were grouped by age. In the 20-29 age group, the heights were normally distributed, with a mean of 67.8 inches and a standard deviation of 4.0 inches. A study particip..
According to table, which presents a MODI solution for a transportation problem, if that solution is used, which of the following is true.
You've two separate sets of data. From one set you calculate the standard error to be 500. From the other set, the standard error was 5.
The numbers of years served by selected past members of the U.S. Supreme Court is listed below. Find the percentile rank for each value. Which value corresponds to the 40th percentile? Construct a boxplot for the data and comment on their shape.
A teacher gave a 25 question multiple choice test. After scoring the tests, she computed a mean and standard deviation of the scores. The standard deviation was 0. Based on this information
A random sample of 25 statistics examinations was taken. The average score in the sample was 76 with a variance of 144. Assuming the scores are normally distributed, the 99% confidence interval for the population average examination score is:
Using a 5% level of significance, can we say that, generally there is important difference between satisfaction levels of mid country residents and coastal residents?
Develop a minimum cost schedule for the part-time employees. (How many start at each hour?). What is the total payroll for the part-time employees?
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