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A market research company employs a large number of typists to enter data into a computer database. The time it takes for potential new typists to learn the computer system is known to have a Normal distribution with a mean of 90 minutes and a standard deviation of 18 minutes. A candidate is automatically hired if she learns the computer system in less than 100 minutes. A cut-off time is set at the slowest 10% of the learning distribution. Anyone slower than this cut-off time is definitely not hired. What proportion of the candidates will be hired automatically?
Assume a linear relationship, use the least square method to find the regression coefficients bo and b1 and Predict the mean kilowatt usage when the average temperature is 50 degrees Fahrenheit.
The ANOVA procedure is a statistical approach for determining whether or not:
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?
Make up a scatter diagram with 10 dots for each of the following situations:
A recent study of 75 workers found that 53 people rode the bus to work each day. Find the 95 percent confidence interval of the proportion of all workers who rode the bus to work.
To find the probability values in case of raw data, binomial, normal
Is there a meaningful relationship between grades and SAT scores? If a student scores a 450 on the SAT what will her GPA be?
At the 5 percent level of significance, does this sample prove a violation of the guideline that the average patient should pay no more than $250 out-of-pocket? State your hypotheses and decision rule.
To test whether there is any association between two variables using Chi-Square test for independence.
Three members of a club will be selected to serve as officers. The first person selected will be president, the second person will be vice-president and the third will be secretary/treasurer.
Construct a 95% confidence interval estimate for the population proportion of administrative professionals who prefer cash bonuses.
Discuss a recent research project undertaken in the last 3 to 5 years. What type of analysis was conducted? What decisions were made?
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