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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.
A professor in the psychology department would like to determine whether there has been a significant change in grading practices over the years.
What are some of the words that form clues? How does one know what is a population parameter and a test statistic?
Probability for simple and compound events.A certain bowler can bowl a strike 70% of the time. What is the probability that she.
Construct a 90 percent confidence interval for the true mean weight. (b) What sample size would be necessary to estimate the true weight with an error of 0.02 grams with 90 percent confidence?
the correlation between the number of police on the street and the number of crimes committed for a sample of 15
At 0.05 level of significance, is there evidence of noteworthy difference in variation in sales among different aisle locations?
Caselet on McDonald’s vs. Burger King - Waiting time
Use rejection points and previously given sample information to test the hypothesis you set up in part a by setting alpha equal to 010, .05, .01, and .001.
A study of 200 apples trees showed that the average number of apples per tree was 1000. The standard deviation of the population is 200. Which of the following is the 98% confidence interval for the mean number for all apples.
a certain kind of appliance requires repairs on the average once every 2 years. assuming that the times between
we have given the number of successes and the sample size for a simple random sample from a population. in each case do
question a researcher wishes to estimate the average amount of money that a person spends on lottery tickets per
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