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Question: Because of inadequate public school budgets and lack of money available to teachers for classroom materials, many teachers often use their own money to buy materials used in the classrooms. A random sample of 100 public school teachers selected from an eastern state showed that they spent an average of $273 on such materials during the 2009 school year. The population standard deviation was $60.
a. What is the point estimate of the mean of such expenses incurred during the 2009 school year by all public school teachers in this state?
b. Make a 95% confidence interval for the corresponding population mean.
In terms of p , the researcher should test which of the following null and alternative hypotheses?
A survey found that at most 40% of those surveyed planned to get more sleep. A sample of 300 people found that 140 of them plan to get more sleep. For alpha = 0.01, what is the critical value?
suppose the probability distribution for x 5 number of jobs held during the past year for students at a school is as
State the underlying assumptions for the statistical test. State whether the assumptions have been met. If the assumptions were not met (either in actuality or hypothetically), state what alternatives you have available to you
Discuss how t test can be employed in hypothesis testing by the use of directional vs. nondirectional hypotheses. Discuss types of research where using the t statistic may be an appropriate alternative to using a z-score.
MATH 221 Statistics for Decision Making Assignment. Create plots for the three binomial distributions above. You can create the scatter plots in Excel by selecting the data you want plotted, clicking on INSERT, CHARTS, SCATTER, then selecting the ..
For the Minolta sample, the average sample rating is 7.8, and the standard deviation is 1.8. Is there a difference between the average population ratings of the two cameras? If so, which one is rated higher?
He measures the heights of 25 men from this century and finds the mean and standard deviation for his sample.
The distribution of test scores is mui=35 and a standard deviation of 15. Do students taking the supplement have significantly better memory scores? Use a one-tailed t-test with an alpha=0.05.
Translate the following statements into symbolic form using capital letters to represent affirmative English statements.- Cartier does not make cheap watches.
What is meant by an overall type I error rate? If Rules 1, 2, and 3 of this chapter are used simultaneously, assuming independence, what is the probability of an overall type I error if 3σ control limits are used?
8.which of the statements about line-balancing is true?a.if a precedence relationship exists between tasks a and b they
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