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Hypothesis Testing

Null, Alternative Hypotheses & Critical region

The production line that packages boxes of raisins at a snack food manufacturer will be conisdered operating properly if the average weight of the boxes of raisin is 3.5 ounces with a standard deviation of 0.3 ounces. A random sample of 20 boxes showed an average weight of 3.30 ounces. Answer questions 4 and 5 based upon this i

Nondirectional Test

For independent samples of customers of Internet providers A and B, the ages are as listed in file XR11073. Using the 0.05 level of significance in a nondirec- tional test, examine whether the variation in ages could be the same for customers of the two providers. Prov

Hypothesis Testing: Comparison of Standard Deviations

11.70. According to the National Association of Homebuilders, the average life expectancies of a dishwasher and a garbage disposal are about the same: 10 years. Assume that their finding was based on a sample of n1 = 60 dishwashers and n2 = 40 garbage disposals, and that the corresponding sample standard deviations were s1 = 30

Interpret the P-Value using a One-Tail Test for SAT Scores

A study has been conducted to examine the effectiveness of new experimental program for preparing high school students for the Scholastic Aptitude Test. Eighty students have been randomly divided into two groups of 40. The eventual SAT scores for those exposed to the new program and the conventional program are listed in data fi

Statistics: AIU Job Satisfaction Studies. Perform a two-tailed hypothesis test

Using AIU's survey responses from the AIU data set,complete the following requirements in the form of a report: 1. Perform a two-tailed hypothesis test on both the intrinsic and the extrinsic variable's data, using a .05 significance level. 2. Begin by creating a null and an alternate statement. 3. Use Microsoft Excel

Questions about Hypothesis Testing of Mean & Proportion

Please provide explanations in detailed and attach all work on a words doc for explanations. Do all work on excel. 1. You are the manager of a restaurant that delivers pizza to college dormitory rooms. You have just changed your delivery in an effort to reduce the mean time between the order and completion of delivery from t

Using Statistical Techniques to teach computers to workers on an assembly line

A group of workers on a manufacturing assembly line type information into a computer. They take a training class on how to use a computer, especially as related to data entry. You want to understand if the computer training was effective. How would you go about this, using statistical techniques? Explain fully. NOTE: Please u

Hypothesis Testing of Mean Standard Deviation

See attached file - Hypothesis Test for Population Mean Hypothesis Test for Population Mean, σ Known Carry out a hypothesis test for the population mean when the population standard deviation is known. Z-Test: Mean hours Mean Standard Deviation

Hypothesis Testing of Mean: Number of Patients per Day

The post anesthesia care area (recovery room) at St. Luke's Hospital in Maumee, Ohio was recently enlarged. The hope was that with the enlargement the mean number of patients per day would be more than 25. A random sample of 15 days revealed the following numbers of patients. 25 27 25 26 25 28 28 27 24 26

10.74 IRS audits: P-Value - 0.10 Level of Significance

It has been reported that 80% of taxpayers who are audited by the Internal Reve- nue Service end up paying more money in taxes. Assume that auditors are random- ly assigned to cases, and that one of the ways the IRS oversees its auditors is to monitor the percentage of cases that result in the taxpa

10.57 Insurance Information Institute: P-Value - Automobile Insurance

SEE ATTACHED FILE - p-Value - Automobile Insurance (10.57) According to the Insurance Information Institute, the mean annual expenditure for automobile insurance for U. S. motorists is $706. Suppose that a government official in North Carolina has surveyed a saimple random sample of 80 residents of

Hypothesis Testing of Mean: Daily coffee consumption

The International Coffee Association has reported the mean daily coffee consumption for U.S. residents as 1.65 cups. Assume that a sample of 38 people from a North Carolina city consumed a mean of 1.84 cups of coffee per day, with a standard deviation of 0.85 cups. In a two-tail test at the 0.05 level, could the residents of thi

Remodeling Magazine: P-Value Population, Standard Deviation

SEE ATTACHED FILE - p-Value Population Standard Deviation (10.33) According to Remodeling magazine, the average cost to convert an existing room into a home office with custom cabinery and rewiring for electronic equipment is $5976. Assuming a population standard deviation of $1000 and the sample of home office conversion

P-Value Approach to Hypothesis Testing

SEE ATTACHED FILE - p-Value Approach to Hypothesis Testing (10.28) For a sample of 12 items from a normally distributed population for which the standard deviation is σ = 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 f

Problems with Null and Alternative Hypotheses

Many law enforcement agencies use voice-stress analysis to help determine whether persons under interrogation are lying. If the sound frequency of a person's voice changes when asked a question, the presumption is that the person is being untruthful. For this situation, state the null and alternative hypotheses in verbal terms,

Statistics: Calculate p value and interpret; 95% confidence interval; mean, range

PROBLEM 1 NBC TV news, in a segment on the price of gasoline, reported last evening that the mean price nationwide is $1.50 per gallon for self-serve regular unleaded. A random sample of 35 stations in the Milwaukee, WI, area revealed that the mean price was $1.52 per gallon and that the standard deviation was $0.05 per gall

Econometrics Problem

Table 3-6 gives data on X (net profits after tax in U.S. manufacturing industries [$, in millions]) and Y (cash dividend paid quarterly in manufacturing industries [$, in millions]) for years 1974 to 1986. a. What relationship, if any, do you expect between cash dividend and after-tax profits? b. Plot the scattergram between

Statistics: One or two-tailed test, paired sample, ANOVA

See attached file. 25. The management of Discount Furniture, a chain of discount furniture stores in the Northeast, designed an incentive plan for salespeople. To evaluate this innovative plan, 12 salespeople were selected at random, and their weekly incomes before and after the plan were recorde

Business Statistics: Evaluate a new textbook with student sample

Whenever we perform a statistical test, we calculate a so-called p-value, which ranges between 0.00 and 1.00. In general terms, the value of p tells us the probability of drawing a sample WITH THESE CHARACTERISTICS if the null hypothesis is TRUE. Here's a simple example. H1: On average, ten-year-old boys are taller than ten

Statistics: Personality test, lightbulbs, education, insomnia, summer clothing

See attached file for 5 problems. One personality test available on the World Wide Web has a subsection designed to assess the "honesty" of the test-taker. After taking the test and seeing your score for this subsection, you're interested in the mean score, , among the general population on this subsection. The website reports

Hypothesis Test for Mean, Standard Deviation and Type 2 Error

Statistics Hypothesis test for mean time, standard deviation, type II error Executives of a supermarket chain are interested in the amount of time that customers spend in the stores during shopping trips. The mean shopping time, μ spent by customers at the supermarkets has been reported to be 35 minutes, but executives hire a

Descriptive statistics and Hypothesis test for proportion vs. hypothesized value

See attached file for 3 problems: Tesla Motors, PC manufacturer and large insurance company claims 4. Tesla Motors needs to buy axles for their new car. They are considering using Chris Cross Manufacturing as a vendor. Tesla's requirement is that 95% of the axles are 100 cm ± 2 cm. The following data is MegaStat output from

Calculate the mean rating of caseworker for males and females.

1. You are conducting an evaluation of services at a social service agency. One of the evaluation issues is finding out whether male clients rate the quality of casework services as highly as do female clients. You have collected following data on the clients: Gender Rating of Caseworker male 4 female 4 female 5 female 5

Three relevant variables and describe one operationalization

A datum (singular of data) may be either a variable or a constant, depending upon the situation. A variable is something that...well, varies, while is constant is just that. Example: In the general population, sex is a variable. In a monastery, it's a constant. Another example: In the general population, monthly pay is a variabl