The director of a state agency believes that the average starting salary for clerical employees in the state is less than $30,000 per year. To test her hypothesis, she collected a simple random sample of 100 starting clerical salaries from across the state and found that the sample mean is $29,750. 1: State the appropriate n
Provide the relevant critical value for each of the following circumstances: 1: HA: μ > 13, n = 15, σ = 10.3, Level of Significance = 0.05 2: HA: μ =/ 21, n = 23, s = 35.40, Level of Significance = 0.02
Refer to the Baseball data set posted which reports information on the 30 Major League Baseball teams for the 2002 season. a. At the .05 significance level, can we conclude that there is a difference in the mean salary of teams in the American League versus teams in the National League? Explain b. At the .05 signi
The Human Resources Director for a large company is studying absenteeism among hourly workers. A sample of 120 day shift employees showed 15 were absent more than five days last year. A sample of 80 afternoon employees showed 18 to be absent five or more times. At the 0.01 significance level can we conclude that there is a highe
Is the mean salary of accountants who have reached partnership status higher than that for accountants who are not partners? A sample of 15 accountants who have the partnership status showed a mean salary of $82,000 with a standard deviation of $5,500. A sample of 12 accountants who were not partners showed a mean of $78,000 wi
A) Research Problem: Are students spending less time in studies now (in 2009) than they did in 2002? (B) Research Problem: Are males spending less time in studies now (in 2009) than they did in 2002 as compared to females now (in 2009) than they did in 2002?
The average speed of greyhound dogs is about 18.8 meters per second. A particular greyhound breeder claims that her dogs are faster than the average greyhound. In a sample of 45 of her dogs, they ran, on average, 19.2 meters per second with a standard deviation of 1.4. Is her claim correct if she is willing to accept an error
At a certain university, the average cost of books per student was $400 per student last semester. In a sample of 40 students this semester, their average cost was $430 with a standard deviation of $80. The Dean of Students believes that the costs are greater this semester. What is the test value for this hypothesis?
Develop one business research question from which you will formulate a research hypothesis that will test two populations. Prepare a 1,050-1,750-word paper describing the results of a hypothesis test of two populations. Be sure to include the following in your paper: a. Formulate both a numerical and verbal hypothesis stat
Identify a research issue, problem, or opportunity that uses data that has absolute zero measurements and ratio level data. Create a paper that describes the results of a hypothesis test on your selected research issue, problem, or opportunity. Begin by describing your selection. Then, formulate both a numerical and verbal h
Exercises 9.54 Faced with rising fax costs, a firm issued a guideline that transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 wi
The district manager of Jason's, a large discount electronics chain, is investigating why certain stores in her region are performing better than others. She believes that three factors are related to total sales: the number of competitors in the region, the population in the surrounding area, and the amount spent on advertising
Using numerical data from one of the data sets available through the "Data Sets" link on your page (please refer to the attached file), develop one business research question from which you will formulate a research hypothesis that will test two or more populations. Prepare a 1,050-1,750-word paper describing the results of a
Can a hypothesis test on a recipe for making pancakes from the recipe on the back of the Bisquick box. Should it be based on the number of pancakes it says the recipe could make? For example, it would say that it yields 14 pancakes. Will the recipe yield the 14 pancakes it claims it will? or If the correct amount of pan
How might one know if an error was made in accepting or rejecting the null hypothesis? Do you suppose the nature of the research has an influence on the selection of the significance level? Why or why not? Why might it be important to state the decision rule when it may be clear in step 1 -the hypothesis statements?
1. The width of a confidence interval is equal to twice the value of the margin of error. Explain your answer. 2. What is the first step in hypothesis testing?
A local bottling company has determined the number of machine breakdowns per month and their respective probabilities as shown below: Number of Breakdowns Probability 0 0.12 1 0.38 2 0.25 3 0.18 4 0.07 ____ 1. Refer to Exhibit 1-1. The expected number of machine breakdowns per month is a. 2 b. 1.70 c. one, since i
For a sample of 12 items from a normally distributed population for which the standard deviation is s=17.0, the sample mean is 230.8. At the 0.05 level of significance, test Ho:µ<= 220 versus H1:µ>220. Determine and interpret the p-value for the test.
Using statistical terms explain, what does "individual packages of cereal may weigh slightly more or less than the marked weight due to normal variation incurred with high speed packaging machines, but each day's production of cereal will average slightly above the marked weight." Also explain is words a hypothesis test for chec
Using the data derived from the M&M experiment in class develop one research question from which you will formulate a research hypothesis. prepare a 350-700words paper describing the results of a hypothesis test of one population mean or population proportion. be sure to include the following in your paper a. formulate bo
Construct hypotheses statements based on: 1) Conduct a test of hypothesis to determine if the mean annual wage is greater than $30,000. Use the 0.05 significance level. Determine the p-value and interpret the result 2) Conduct a test of hypothesis to determine if the mean year of experience is different from 20. U
Use the following to answer questions 1-6.: A national manufacturer of ball bearings is experimenting with two different processes for producing precision ball bearings. It is important that the diameters be as close as possible to an industry standard. The output from each process is sampled and the average error from the
A restaurant claims that its speed of service time is less than 18 minutes. A random selection of 36 service times was collected, and their mean was calculated to be 17.1 minutes. Their standard deviation is 3.1 minutes. Is there enough evidence to support the claim at alpha = .08. Perform an appropriate hypothesis test, showing
Perform hypothesis testing on one variable's data. (Choose either the intrinsic or extrinsic column.) Perform a t-test by formulating a null and an alternative statement, choosing an acceptable significance value, determining the appropriate critical value, selecting the test statistic and determining its value from the sample d
Please conduct a hypothesis test for a single population mean of a quantitative variable equal to a given number. For example, test the hypothesis that the population mean of the intrinsic is equal to 5 or not. Use all 25 data rows. Since n<30, use a t statistic. For this and any hypothesis test, number the five steps
A regional commuter airline selected a random sample of 25 flights and found that the correlation between the number of passengers and the total weight, in pounds, of luggage stored in the luggage compartment is 0.94. Using the .05 significance level, can we conclude that there is a positive association between the two variables
1) What are the five steps involved in classic hypothesis testing? 2) In general, what is a "Critical Value" or "Cut-Off Score" of a test statistic? What are the critical values of z for a two-tailed test (.05)? What are the critical values of z for a one-tailed test (.05)? What are the critical values of z for a two-
A random sample of 51 observations was selected from a normally distributed population. The sample mean was x = 88.6 , and the sample variance was s2 = 38.2. We wish to determine if there is sufficient reason to conclude that the population standard deviation is not equal to 8 at the 0.05 level of significance. Calculate the
If two independent samples are used in a hypothesis test concerning the difference between population means for which the combined degrees of freedom is 20, which of the following could not be true about the sample sizes n1 and n2? A) n1=12 and n2=8 B) n1=12 and n2=10 C) n1=13 and n2=9 D) Cannot be determined from the given
Which of the following would be the hypothesis for testing the claim that the proportion of students at a large university who smoke is significantly different from 0.15? A) H o: p = 1.5, H a: p > 1.5 B) H o: p = 1.5, H a: p is not equal to 1.5 C) H o: p > 1.5, H a: p = 1.5 D) H o: p < 1.5, H a: p > 1.5.