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The mean gross incomes of certified welders are normally distributed with the mean of $20,000 and a standard deviation of $2,200. The ship building association wishes to find out whether this number is still accurate. You take a sample of 45 welder's salaries and find the average to be $21,500. Using a significance level of 0.10, has there been a change in the mean gross annual income of certified welders?
a. State the null and alternate hypothesis
b. What is the level of significance?
c. What is the critical value?
d. Compute the value of the test statistic
e. What is your decision regarding the null hypothesis? Interpret the result.
In both cases, give a number of data points, n, and a correlation coefficient, r. Draw a number of data points, n, and a correlation coefficient, r. Tell whether the correlation is significant at 0.05 or 0.01 level, explain.
A regional manager visits local fast-food franchises and evaluates the speed of the service. If the manager receives her meal within 45 seconds, the server is given a free movie-admission coupon.
The professor plots a histogram of these several proportions. Should a Normal model be used to represent the sampling distribution of the proportion of tails?
Will the sum of squared deviation scores be greater for the test or the exam (assume the same number of people sat both the test and the exam)? Why?
A population of size 1,000,000 claims has mean cycle time of 15 days, and a standard deviation of 4. 100 random samples of each size 64 are selected. What will be the approximate standard deviation of 100 sample means.
In 1992, the FAA conducted 90,000 pre-employment drug tests on job applicants who were to be engaged in safety and security-related jobs, construct a 95 percent confidence interval for the population proportion of positive drug tests.
listed below are the number of years that popes and british monarchs lived after their election or coronation. treat
Make a point estimate of the population mean difference in endurance after taking the herbs. Make a 95% confidence interval estimate of the population mean difference.
Draw a ball from number 1: if red go to number 2; if black go to number 3. What is probability
you have received a year end bonus of 5000. you decide to invest the money in the stock market and have narrowed your
You are planning to test a vaccine for a virus that has no vaccine. Since the disease is usually not serious, you will expose 100 volunteers to the virus. After some time, you will record whether or not each volunteer has been infected.
What is the probability that Dave wins the sprint and what is the probability that Dave wins and John places second, what is the probability that Ed finishes last
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