Given the following situation, how would you use Megastat to test whether the population defective rate is greater than 5%? Please outline the process for the test and, if necessary, including the output from Megastat to explain your approach. What assumption do you need to check to make sure that the analysis is valid. "A ra
The president of the American Insurance Institute wants to compare the yearly costs of auto insurance offered by two leading companies. He selects a sample of 15 families, some with only a single insured driver, others with several teenage drivers, and pays each family a stipend to contact the two companies and ask for a pric
38. A recent article in The Wall Street Journal reported that the 30-year mortgage rate is now less than 6 percent. A sample of eight small banks in the Midwest revealed the following 30-year rates (in percent): 4.8 5.3 6.5 4.8 6.1 5.8 6.2 5.6 At the .01 significance level, can we conclude that the 30-year mortgage rate
Scenario: Dole Pineapple, Inc., is concerned that the 16-ounce can of sliced pineapple is being overfilled. Assume the standard deviation of the process is .03 ounces. The quality control department took a random sample of 50 cans and found that the arithmetic mean weight was 16.05 ounces. At the 5 percent level of significance,
See attached data file. Describe and perform the five-step hypothesis test process: Set up the hypothesis, Select a level of significance, Establish the decision rule, Calculate the test statistic, Draw conclusion. One Sample Hypothesis Using the Major League Baseball Data Set available through the "Data S
A random sample of eighty-five students in Chicago city high schools takes a course designed to improve SAT scores. Based on these students, a 90% confidence interval for the mean improvement in SAT scores from this course for all Chicago city high school students is computed as (72.3, 91.4) points. The correct interpretation of
See attached file. Please use the following numbers in the attached formula to solve the problem. All numbers are already calculated for you. Remember, Please (parentheses), Forgive (factor), My (multiplication), Dear (division), Aunt (addition), Sally (subtraction). Please complete the following using the 5 steps of hypo
Medicare spending per patient in different U.S. metropolitan areas may differ. Based on the sample data below, is the average spending in the northern region significantly less than the average spending in the southern region at the 1 percent level? (a) State the hypotheses and decision rule. (b) Find the test statistic a
See attached baseball 2007 data. Learning Team Assignment: One Sample Hypothesis Testing Paper · Use the ratio or interval numerical data from one of the data sets available through the Data Sets link on your student Web site. · Develop one research question from which you will formulate a research h
Michelle is a counselor at the local crises center. She wishes to determine if there is a relationship between the gender of an individual and the amount of alcohol consumed. She took a random sample of 68 files to test her assumption. At the .05 significance level, can she conclude that alcohol consumption is related to gender?
CJ's Discount Appliance Store issues its own credit cards. The credit manager wants to know if the mean monthly, unpaid balance is more than $400. The level of significance is .05. A random check of 200 unpaid balances revealed the sample mean of $420 and the standard deviation of the sample is $40. Should the credit manager
See attached baseball 2007 data. 1. Learning Team Assignment: One Sample Hypothesis Testing Paper · Use the ratio or interval numerical data from one of the data sets available through the Data Sets link on your student Web site. · Develop one research question from which you will formulate a r
Koi's Yummy Burgers claims that 90% of its orders are delivered within 10 minutes of the time the order is placed. A sample of 100 orders revealed that 82 were delivered within the promised time. At the .05 significance level, can we conclude that 90% of the orders are delivered in less than 10 minutes? 43. What test is mos
Hiren is the accounts receivable manager of an local hopital. The hospital is concerned that people are using ER services have sufficient resources to cover their visit. According to research, Hiren has found that indigent patients use the ER as a facility of convenience and not for true emergencies He reviewed a ra
At age 9, the average weight (21.3 kg) and the average height (125.5 cm) for both boys and girls are the same. A random sample of both boys and girls yielded these results. Do your results support this claim? ( Boys Girls mean 22.6 20.4 variance 20 19 n 60 50 Adapted from Bluman, 2004, p.
Part 4 The production manager at Bellevue Steel, a manufacturer of wheelchairs, wants to compare the number of defective wheelchairs produced on the day shift with the number on the afternoon shift. A sample of the production from 6 day shifts and 8 afternoon shifts revealed the following number of defects. Assume this is a t
A researcher is testing the effectiveness of a new herbal supplement that claims to improve memory performance. A sample of n = 25 college students is obtained and each student takes the supplement daily for six week. At the end of the 6-week period, each student is given a standardized memory test, and the average score for the
What is the effect of the significance level (alpha) on the likelihood of 1) rejecting the null hypothesis, and 2) committing a type I error or a type II error? Why does the significance level differ among industries?
Is the null hypothesis more likely to be rejected at alpha = 0.01 than alpha = 0.10? As the significance level increases to alpha = 0.10 from alpha = 0.01, which type of error (type I error or type II error) is more likely to occur? What may be done to reduce the likelihood of incurring this error? Why does the significance lev
AVX Stereo Equipment, Inc recently began a "no hassles" return policy. A sample of 500 customers who had recently returned items showed 400 thought the policy was fair, 32 thought it took too long to complete the transaction, and the rest had no opinion. On the basis of this information, make an inference about customer reaction
In an evaluation of the medical lab, the manager is interested in the efficiency of three technicians when they process four routine blood tests. The following data measures in minutes the amount of time it takes each technician to provide each of the procedures. At the .05 significance level, is there a significant difference i
A clinical investigator is interested in understanding the relationship between demographic factors and congestive heart failure, measured by a cardiac index (CI). A random sample of 12 patient charts of CHF patients revealed the data below. Using the five-step hypothesis test at the .05 level, determine what demographic factors
The average monthly gasoline (gallon) purchase for a family with 2 cars is 62 gallons.This statistic has a normal distribution with a standard deviation = 6 gallons. A family is chosen at random. a)Find the probability that the family's monthly gasoline (gallon) purchases will be between 47 and 67 gallons. _________________
A population of scores with µ = 73 and sigma = 6 is standardized to create a new population with µ = 50 and sigma = 10. What is the new value for each of the following scores from the original population? Scores: 67, 70, 79, 82. X = 67 --> z =_____ --> X =_____ X = 70 --> z =_____ --> X =_____ X = 79 --> z =
On a psychology exam with µ = 76 and σ = 12, Tom scored 8 points below the mean, Mary had a score of X = 73, and Bill had a z-score of z = -0.50. Place these three students in order from lowest to highest score. 1 ---circle/select one ( Bill Mary Tom ) - student with lowest score 2 ---circle/select one ( Tom Mary Bil
Drinking Habits: A Readers Digest Gallup Survey on drinking habits..... Christmas Presents: The Arizona Republic conducted a telephone poll........ Families in Poverty: In 2000, 8.6% of all U.S. families had income below the poverty level........... See the attached file.
A recent study by the Department of Transportation reported that 40% of major traffic accident this year had alcohol as a contributing factor. Hill Insurance decided to investigate their insurance claims to see if they were significantly different than the DoT's figures. A sample of 200 insurance claims for major accidents
JoLynn Miller is a physical therapist at the local senior center. She has been testing a new procedure to improve leg strength that requires the patient to use weights to do repetitions using a new apparatus. JoLynn decides to test the effectiveness of the apparatus on two patients with similar mobility restrict
Exercise 27: A recent study focused on the number of times men and women who live alone buy take-out in a month. The information is summarized below Statistic Men Women Sample Mean 24.51 22.69 Population Standard Deviation 4.48 3.86 Sample Size 35 40 At the .01 significance level, is there a difference in the mean num
Hypothesis test for a population proportion A recent study at a local college claimed that the proportion, P , of students who commute more than fifteen miles to school is no more than . If a random sample of students at this college is selected, and it is found that commute more than fifteen miles to school, can we reject
A postal researcher wanted to test the theory that a higher response rate is achieved when a postal questionnaire is sent out with a personalized covering letter (A) than when the covering letter is impersonal (B). Two random samples of 100 people were selected. When the questionnaires were dispatched, the first sample-receive