An extensive study of the cost of health care in the United States presented data showing that the mean spending per Medicare enrollee in 2003 was $6883 (Money, Fall 2003). To investigate differences across the country, a researcher took a sample of 40 Medicare enrollees in Indianapolis. For the Indianapolis sample, the mean 200
(a) What is the critical value and how is the critical value used in hypothesis testing? (b) Look at the example in the attachment about the new drug, Releeva. In the Releeva example, the sample size is sufficiently large (100 patients), thus we can assume normality and use a Z statistic for the hypothesis testing procedur
See attached files. 1. You are the manager of a restaurant that delivers pizza to college dormitory rooms. You have just changed your delivery process in an effort to reduce the mean time between the order and completion of delivery from the current 25 minutes. From past experience, you can assume that the population st
1. When a researcher has two samples with two means, one of the assumptions for two samples is independence of between the two samples. What does this mean? What happens if the independence assumption is violated? 2. What are the differences among a proportion, a percentage, and a ratio? When would a researcher use a hypothe
Suppose you want to study the population of full-time college students in State X. In this state, there are 200,000 full-time college students. Out of these students,50,000 students study at private schools, and the other 150,000 students study at state schools. You have drawn a stratified sample using private school students an
The manager of Petroco service station wants to forecast the demand for unleaded gasoline next month so that the proper number of gallons can be ordered from the distributor. The owner has accumulated the following data on demand for unleaded gasoline from sales during the pas 10 months: Months Gasoline Demand
Suppose you have drawn a simple random sample of 400 business executives. In this sample, 150 executives owned Blackberries. At a 95% level of confidence, test the null hypothesis that not more than 30% of business executives own Blackberries.
1. Describe what is measured by the estimated standard error in the bottom of the independent-measures t statistics. 2. Do you view a chocolate bar as delicious or as fattening? Your attitude may depend on your gender. In a study of American college students, Rozin, Bauer, and Catanese (2003) examined the importance of food a
Question 1 The New York study indicated that the average number of beds in the sampled data was 215. It is known that the average number of beds in the population of interest is 136. Test using a two tailed hypothesis. Test the hypothesis that the mean of 215 is statistically equal to 136. That is, any difference
A random selection of volunteers at a research institute have been exposed to a typical cold virus. After they started to have cold symptoms, 15 of them were given multivitamin tablets daily which contain 1 gram of vitamin C and various other vitamins and minerals. The remaining 15 volunteers were given tablets only containing 4
1. If the alternative hypothesis states that mu > 6700 the rejection region for the hypothesis is: a) Both tails b) Lower tail c) Upper tail d) Center e) None of the above 2. For a one tailed hypothesis test, the critical value of the test statistic is -2.33. Which of the following is true about the hypothesis test? a)
An engineering firm is evaluating their back charges. They originally believed their average back charge was $1800. They are concerned that the true average is higher, which could hurt their quarterly earnings. They randomly select 40 customers, and calculate the corresponding sample mean back charge to be $1950. If the standa
A 15-minute Oil and Lube service claims that their average service time is no more than 15 minutes. A random sample of 35 service times was collected, and the sample mean was found to be 16.2 minutes, with a sample standard deviation of 3.5 minutes. Is there evidence to support, or to reject the claim at the alpha = 0.05 level?
A poll of U.S. health professionals revealed 82% would choose the same career. In a hypothesis test conducted at a level of significance of 5%, a P-value of 0.023 was obtained. Choose the best interpretation of the hypothesis test.
1. In Dallas, some fire trucks were painted yellow (instead of red) to heighten their visibility. During a test period, the fleet of red fire trucks made 153,348 runs and had 20 accidents, while the fleet of yellow fire trucks made 135,035 runs and had 4 accidents. At alpha = .01, did the yellow fire trucks have a significantly
(AARP) reports that 60% of retired persons under the age of 65 would be willing to return to work on a full time basis if a suitable job were available. A sample of 700 retired persons under the age of 65 revealed 520 would return to work. Can we conclude that more than 60% of retired people in the age group would return to
Please assist with all parts. Thank you!!! Palm Products Company has collected data on its average variable costs of production for the past 12 months. The costs have been adjusted for inflation by deflating with an appropriate price index. The AVC and associated output data are presented below: obs Q AVC obs Q A
Last fall, a sample of n = 36 freshmen was selected to participate in a new 4-hour training program designed to improve study skills. To evaluate the effectiveness of the new program, the sample was compared with the rest of the freshman class. All freshmen must take the same English Language Skills course, and the mean score on
A research would like to examine the effects of humidity on eating behavior. It is known that laboratory rats normally eat an average of µ = 21 grams of food each day. The research selects a random sample of n = 16 rats and places them in a controlled atmosphere room in which the relative humidity is maintained at 90%. The dail
Formulate both a numerical and verbal hypothesis statement regarding the wages of different ages. Wage Industry Occupation Ed South Nonwh Hisp Fe Ex Marr Age Union 19388 1 0 6 1 0 0 0 45 1 57 0 49898 2 0 12 0 0 0 0 33 1 51 1 28219 0 3 12 1 0 0 0 12 1 30 0 83601 0 5 17 0 0 1 0 18 1 41 0 29736 0 4 8 0 0 1 0 47 1 61 1 5023
An automobile assembly line operation has a scheduled mean completion time of 2.2 minutes. Because of the effect of completion time on both preceding and subsequent assembly operations, it is important to maintain the 2.2 minute mean completion time. A random sample of 45 assemblies resulted in the completion times shown in the
A researcher is evaluating the influence of a treatment using a sample selected from a normally distributed population with a mean of u = 80 and a standard deviation of o= 20. The researcher expects a 12 point treatment effect and plans to use a two-tailed hypothesis test with a = .05. a. Compute the power of the test if
1. Which of the following is not a characteristic of the normal probability distribution? a. The mean, median, and the mode are equal b. The mean of the distribution can be negative, zero, or positive c. The distribution is symmetrical d. The standard deviation must be 1 e. None of the above answers is correct. 2. Whic
Problem 3 A sales manager wants to know if the sales productivity of her east region is greater than the sales productivity of her west region. The results of a sample of 12 salespersons from the east region and 16 salespersons from the west region are shown below. Perform the appropriate hypothesis test using alpha = .05
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 with a standa
1. A researcher is investigating the effectiveness of a new study-skills training program for elementary school children. A sample of n =25 third-grade children is selected to participate in the program and each child si given a standardized achievement test at the end of the year. For the regular population of third-grade child
Perform a two-tailed hypothesis test on the intrinsic variable AND a two-tailed hypothesis test on the extrinsic variable's data using a .05 significance level for each. Begin by creating a null and an alternate statement. Use Microsoft Excel to process your data. Copy and paste the results of the output to your report in Micr
a) For the CD Camera problem situation: interpret the p-value you calculated, in the terms of the problem. b) For the CD Camera problem situation: compare the test statistic you calculated to the corresponding critical value (NOTE: be sure to use the value of Alpha given in the test statistic question when calculating th
CD Camera produces a new camera that it claims can take an average of more than 7 photographs per second. A test of 49 randomly selected cameras yielded the following sample values: mean= 7.2 Photos/sec S=.58 photos/sec Use Alpha = 0.05. Calculate the p-value. answers p-value=.0098 p-value=.1041
Q9 CD Camera produces a new camera that it claims can take an average of more than 7 photographs per second. A test of 49 randomly selected cameras yielded the following sample values: mean =7.2 photos/secn S=.58 photos/sec Use Alpha = 0.05. Compute the value of the test statistic answers t=2.414