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Hypothesis Testing

Final exam

Please see attached document. 1) The statement that determines if the null hypothesis is rejected or not is called the A. critical value B. alternate hypothesis C. test statistic D. decision rule 2) What are the critical z-values for a two-tailed hypothesis test if the significant level = 0.01

Statistics: Chapter 10, 11 and 12 questions

Chapter 10 1. Rutter Nursery Company packages its pine bark mulch in 50-pounds bags. From a long history, the production department reports that the distribution of the bag weights follows the normal distribution and the standard deviation of this process is 3 pounds per bag. At the end of each day, Jeff Rutter, the production

Statistics: Hypothesis testing, Correlation

See attached file. Hypothesis Testing Examine the given statement, then express the null hypothesis H0 and alternative hypothesis H1 in symbolic form. Be sure to use the correct symbol (μ , p ,σ) for the indicated parameter. 1. The majority of college students own a vehicle. 2. Th

Evaluating the method of cooking potato chips affects taste

See attached files. SPSS Exercise Questions If you know how to operate SPSS, the assignment is fairly simple. The instructions are long, because I have included the scenarios as well. All datasets will be automatically entered into the SPSS by access the link below. I just need the measures ran and a synopsis to show cl

Sportswear Manufacturer: Relationship between Advertising, Coupon Value and Sales

Please see attached file for data. Question: A sportswear manufacturer wishes to investigate the relationship between the level of advertising, coupon value and sales. The manufacturer advertises several times a month and includes a manufacturer coupon (in dollars) with each advertisement. The value of the coupon remains the

Buy.com customer service department: Average call length at call center

See attached files. Assume all data/output is normal. 4. The manager of the customer service department at Buy.com was concerned about the performance of their call center employees. He found that average call times were higher than industry average. The manager decides to invest in a program to train his call center emplo

Statistics MLB 1, 2, 3: Mean incomeby district, aspirin tablets, emphysema drugs

MLB 1 A study was conducted to determine if persons in surburan district I have a different mean income from those in district II. A random sample of 50 homeowners was taken in district I. Although 50 homeowners were to be interviewed in district II also, one person refused to provide the information requested. So only 49 ob

Non-parametric test of hypothesis

Conduct the equivalent, nonparametric test of hypothese using the five-step process. Do the following teams average a salary of 70 million dollars a year or less? The information we are using consist of the following: Teams Salary (in millions) Oakland $55.4 Baltimore $73.9 Los Angeles Angels $97.7 Cleveland $41.5

Is the new paint color mixing machine in home improvement store underperforming?

Please state the hypothesis and explain the type of test to run. 3. A home improvement store recently purchased a new paint color-mixing machine. The machine is rated to produce 6 gallons of mixed paint every minute. The store's manager suspects that the machine is underperforming. In order to test his hypothesis, the manag

Average Lifetime Value (NPV) of transaction expected from customers in FL and CA

Please state the null hypothesis and explain the type of test to run. 1) You are interested in understanding whether the average Lifetime Value (the net present value of all the transaction expected from a customer) for the customers in the Florida is significantly different from those in California. You suspect that the Ca

Which yogurt should have highest amount of space

Please state the hypothesis (statistically) and explain the type (the name) of test I need to run. Please do not do anything else on this one. 1) An organic food retailer sells three types of natural yogurt: plain, low fat and fat-free. The retailer wishes to expand the shelf space allocated to yogurt and decides to allocate

8 questBusiness Applications Problem Set Three

See attached problem set 3 and Also some of these reference data sets that came on a disk with our book. 8 questBusiness Applications Problem Set Three This is the third of three business applications problem sets that you will complete for Math 222. To complete the assignment, first save this Word document on your compute

Goodness of fit null hypothesis

Three colors have been proposed for a product: blue, green, yellow. The null hypothesis for a goodness-of-fit test would be . . . A) green is preferred over the other colors B) there is no preference between colors C) any one color is preferred over the other colors D) impossible to determine I believe that 'B' is the

Hypothesis testing on a student investigation

A student investigated whether husbands tend to be older than their wives when they marry. The following data are from a dependent sample of 24 couples who obtained their marriage licenses in Cumberland County, Pennsylvania, in 1993. Using an appropriate two-sample test and a significance level of , determine whether these s

Hypothesis Testing: Consumption of Saturated Fats

Consumption of Saturated Fat: A nutritionist claims that the proportion of females who consume too much saturated fat is lower than the proportion of males who consume too much saturated fat. In interviews with 513 randomly selected females, she determines that 300 consume too much saturated fat. In interviews with 564 randomly

Analyze sample data for time spent going to parties by college freshman

1. National data show that, on average, college freshman spend 7.5 hours a week going to parties. President DeRosa doesn't believe that these figures apply at his school; he thinks freshman at his school party less. He takes a simple random sample of 50 freshmen and interviews them. He asks you to analyze his sample data. You de

Stats: difference in two sample means

Question a: Which of the following conditions must be met to conduct a test for the difference in two sample means? a. Data must be at least of interval scale b. Populations must be normal c. Variances in the two populations must be equal d. A and B correct Question b: Suppose we test the difference between two proporti

Stats: Degrees of freedom and level of siginificance

Question a. A survey of the opinions of property owners about a street widening project was taken to determine whether the resulting opinion was related to the distance of front footage. A randomly selected sample of 100 property owners was contacted and the results are attached. What is the critical value at the 10% level o

Test hypothesis that automakers will produce midsized cars

Suppose the federal government gives a substantial tax break to automakers producing midsized cars that get a mean mileage exceeding 31 MPG. A sample of 49 mileages has a mean x-bar of 31.350 and a standard deviation of s=0.799. Let u be the midsize car's mean mileage. Assume alpha=0.01 a) The following questions, represen

Hypothesis Testing, Confidence Interval & Binomial Probability

1.A sample of 64 college students are asked their weekly (at school) expenses during the fall term. The enquire resulted in a mean of $55 with a standard deviation of $12. Construct a 95% confidence interval for the mean expense for all the students in the school. a. Value from the table ____________ b. The confidence i

Compare data between men and women regarding ACT scores and college GPA

How to determine the difference between men and women regarding ACT scores and college GPA Show my findings Describe what they mean ACT Score College GPA Gender 28 1.72 M 25 3.51 M 21 2.45 F 19 2.85 F 22 2.84 M 15 3.46 F 26 1.97 F 20 3.47 F 23 3.47 M 22 4 M 16 2.94 F 21 1.9 F 23 3.25 M 17 3.23 F 25 3.51 M 19

Hypothesis Testing of Population Mean: Statistic Z

Suppose that we wish to test Ho: µ = 40 versus Ho µ ≠ 40, where σ is known to equal 18. Also, suppose that a sample of n = 81 measurements randomly selected from the population has mean of x bar = 35. (a). Calculate the value of the test statistic z. (b). By comparing z with a critical value, test Ho versus Ha a

Hypothesis Testing of Standard Deviation

A manufacturer uses a new production method to produce steel rods. A random sample of 17 steel rods resulted in lengths with a standard deviation of 21.1cm. At the 0.10 significance level, test the claim that the new production method has lengths with a SD different form 3.5cm which was the SD for the old method. Identify the n

Test Statistic: Population Proportion

A claim was made that the proportion of drowning deaths in children attributable to beaches is more than 0.25 and the sample statistics include n=615 drowning deaths of children with 30% attributable to beaches. What is the value of the test statistic z?

Analyze mileage and vehicle weight vs miles per gallon data

See attached file. Using Data set 'G', choose the dependent variable (the response variable to be 'explained') and the independent variable (the predictor or explanatory variable) as you judge appropriate. Use a spreadsheet or a statistical package (e.g., MegaStat or MINITAB) to obtain the bivariate regression and required gr

Hypothesis-Null & Alternative,P-value for F-test;2-Way ANOVA

See attached file. Hypothesis - Null & Alternative, p-value for F-test (ANOVA) - How to determine significance difference in means 1) An investor wants to know if a difference exists, at a significance level of 0.05, between home prices in three subdivisions. Independent samples of homes from each of the three subdivis

Hypothesis Test

The Rocky Mountain district sales manager of Rath Publishing, Inc., a college textbook publishing company, claims that the sales representatives make an average of 36 sales calls per week on professors. Several reps say that this estimate is too low. To investigate, a random sample of 32 sales representatives reveals that the me


1) If the correlation coefficient r is equal to 0.57, find the coefficient of determination. a) 0.68 b) 0.75 c) 0.45 d) 0.32 2) The prediction interval around y' for a specific x is a) A confidence interval for the true mean value of the y values that correspond to that x b) The value of y used to calculate the slo