A well-known automotive magazine took three top of the line mid size automobiles manufactured in the United States, test-drove them, and compared them on a variety of criteria. In the area of gasoline mileage performance, five automobiles of each brand were each test-driven 500 miles; the miles per gallon data obtained follow.
A large candy manufacturer is concerned that the mean weight of their Chunky Chocolate Crisp bar is not greater than 4.3 ounces. It can be assumed that the population standard deviation is .03 ounces based on past experience. A sample of 100 candy bars is selected and the sample mean is 4.34 ounces. Using a level of significance of .10, is there evidence that the population mean weight of the candy bars is greater than 4.3? Fully explain your answer.
Please use Excel to solve the statistics problem. It is EXTREMELY important that you use EXCEL and prepare a written discussion of problem to accompany the numerical calculations. You should attach the Excel file. A large candy manufacturer is concerned that the mean weight of their Chunky Chocolate Crisp bar is not greater t
Suppose the company that has produced "Get Slim X" now produces an even better diet pill. This new and improved version is called "Get Super Slim X." Health researchers say that the mean weight loss after taking this pill for six months should be 7 pounds. A random sample of 49 people, who want desperately to lose weight, tak
Businesses are increasingly placing orders online. The Performance Measurement Group collected data on the rates of correctly filled electronic orders by industry (Investor's Business Daily, May 8, 2000). Assume a sample of 700 electronic orders provided the following results. See attachment for table. a. Test a hypothes
The American Bankers Association collects data on the use of credit cards, debit cards, personal checks, and cash when consumers pay for in-store purchases (The Wall Street Journal, December 16, 2003). In 1999, the following usages were reported. In Store Purchase Percentage Credit Card= 22% Debit Card=
M&M/MARS, makers of M&M Chocolate Candies, conducted a national poll in which more than 10 million people indicated their preference for a new color. The tally of this poll resulted in the replacement of tan-colored M&Ms with a new blue color. IN the brochure "Colors," made available by M&M/MARS Consumer Affairs, the distribut
The standard deviation in the 12-month earnings per share for 10 companies in the airline industry was 4.27 and the standard deviation in the 12-month earnings per share for 7 companies in the automotive industry was 2.27 (Business Week, August 14, 2000). Conduct a test for the equal variances at a=.05. What is your conclusion
Media Matrix and Jupiter Communications gathered data on the time adults and the time teens spend online during a month (USA Today, September 14, 2000). The study concluded that on average, adults spend more time online than teens. Assume that a follow-up study sampled 26 adults and 30 teens. The standard deviations of the time
A study is performed in a large southern town to determine whether the average weekly grocery bill per four person family in the town is significantly different from the national average. A random sample of the weekly grocery bills of four person families in this town is given in the attached file. a. Assume that the national
A sample of n=9 scores is obtained from a normal population distribution with o-=12. The sample mean is M=60. a- with a two-tailed test and o=.05,use the sample data to test the hypothesis that the population mean is u=65. b- with a two-tailed test and o=.05, use the ample data to test the hypothesis that the population me
Numerous studies have shown that IQ scores have been increasing, generation by generation, for years (Flynn, 1984, 1999). The increase is called the Flynn Effect, and the data indicate that the increase appears to be about 7 points per decade. To demonstrate this phenomenon, a researcher obtains an IQ test that was written in
An automotive part must be machined to close tolerances to be acceptable to customers. Production specifications call for a maximum variance in the lengths of the parts of .0004. Suppose the sample variance for 3 parts turns out to be S2 = .0005. Use a=.05 to test whether the population variance specification is being violate
A law student, who want to check a professor's claim that convicted embezzlers spend on average 12.3 months in jail, takes a random sample of 36 such cases from court files. Using his results, namely, a mean of 10.8 months and a standard deviation of 3.9 months, test the hypothesis u=12.3 versus the alternative hypothesis u≠1
A study of 20 families in a certain large city showed that the average income was $33,210 in 2000 with a standard deviation of $1800. Test the hypothesis that the true average income in this city was actually $31,000 against the hypothesis that it was more. Use a level of significance of 5% (hint: This is a one-sided test).
The following data on annual rates of return were collected from five stocks listed on the New York Stock Exchange ("the big board") and five stocks listed on NASDAQ. At the .10 significance level, can we conclude that the annual rates of return are higher on the big board? NYSE.......Nasdaq 17.16.........15.80 17.08.......
Officials want to test whether drivers are obeying the posted speed limit of 65 mph. Sample: 55 vehicles. Average speed of sample: 69 miles Standard deviation: 7 miles 95% confidence level desired. Test the hypothesis that mean speed is less than or equal to 65 mph against its one-sided alternative. Please see the attac
1. The value of the z-score that is obtained for a hypothesis test is influence by several factors. Some factors influence the size of the numerator of the z-score and the factors influence of the standard error in the denominator. For the following, indicate whether the factor influences the numerator or denominator of the z-
Are females more likely to develop high blood pressure than males? For this research question: Clearly identify the independent and dependent variables you would study. Determine whether a one-tail or two-tail test is most appropriate and explain why. Generate a testable null statistical hypothesis and an alternative
The mean shopping time for women with kids is 7.3 minutes. A random sample of women with children in a shopping store gave the following shopping times in minutes: 7.7 8.1 8.2 9.0 5.8 9.3 8.4 6.9 12.1 9.4 8.1 6.2 7.3 7.9 8.2 8.5 7.2 6.3 9.1 8.8 a) Verify that mean=8.1 minutes and s=1.4
Over the past 8 weeks the horse readings (in mg/100 ml)were 93, 88, 82, 105, 99, 110, 84, and 89. If the sample mean is 93.8, letting x be the random variable, we assume that x has a normal distribution and we know that the population standard deviation is 12.5. The mean glucose level for the horse should be u(population mean)=8
Please see the attached file for the questions on weight-watching and chocolate bar taste.
A study was conducted using 139 students. One of the items studied was the maximun daily amount of alcohol consumed in the last month. Based on the data, are there differences between males and females in the maximum amount of alcohol consumed in any one day in the past month? Use alpha 0.5 Men
The claim that ""40% of those persons who retired from an industrial job before the age of 60 would return to work if a suitable job was available" is to be investigated at the 0.02 level of risk. If 74 out of the 200 workers sampled said they would return to work, what is our decision? (a) Do not reject the null hypothesis b
Statistics: Please complete the following. Show all work using either Microsoft Equation Editor 3.0 or Excel.
9.53 On eight Friday quizzes, Bob received scores of 80, 85, 95, 92, 89, 84, 90, 92. He tells Prof. Hardtack that he is really a 90+ performer but this sample just happened to fall below his true performance level. (a) State an appropriate pair of hypotheses. (b) State the formula for the test statistic and show your decision ru
Statistics - Part 1 - Would like each student in the class to go to the market and purchase 10 bags of M&M regular size candy. This is the 1.69 oz. size ...
Part 1 Would like each student in the class to go to the market and purchase 10 bags of M&M regular size candy. This is the 1.69 oz. size We will be using these candies throughout the rest of the course. Please count the number of M&M's in each bag and calculate the following statistics for your sample of ten bags.
Last year the records of Dairy Land Inc., a convenience store chain, showed the mean amount spent by a customer was $30. A sample of 40 transactions this month revealed the mean amount spent was $33 with a standard deviation of $12. At the 0.05 significance level, can we conclude that the mean amount spent has increased? What is the p-value? Follow the five-step hypothesis testing procedure.
Last year the records of Dairy Land Inc., a convenience store chain, showed the mean amount spent by a customer was $30. A sample of 40 transactions this month revealed the mean amount spent was $33 with a standard deviation of $12. At the 0.05 significance level, can we conclude that the mean amount spent has increased? What
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 α = .01, did the yellow fire trucks ...
10:30: 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 α = .01, did the yellow fire trucks have a signi
11.The company believes that it averages about the same weight per bag in each of two production lines. To test this idea, they will perform a hypothesis test to compare the two lines at the alpha level of 0.05. State the null and alternative hypotheses: 12.If the test calculates a sample Z of 1.69, what is the corresponding
Hypothesis testing - 1.A company is filling bags of rock salt to a level of 50 pounds. It believes that all bags are filled correctly, but would like to use a hypothesis test with an alpha of 0.05 to check this belief. The company will be using samples of 100 bags from each run to do the test. State the null and alternative hypotheses: ...
1.A company is filling bags of rock salt to a level of 50 pounds. It believes that all bags are filled correctly, but would like to use a hypothesis test with an alpha of 0.05 to check this belief. The company will be using samples of 100 bags from each run to do the test. State the null and alternative hypotheses: Is this a
The manufacturer of batteries for aircraft emergency vehicles claims that lifetime of the 1500 batteries that have been manufactured is normally distributed with a mean of at least 30 months and a standard deviation of 3 months. An aircraft manufacturer checks out 25 batteries that they purchased and discovers a sample mean of