Heights were measured for a random sample of 17 plants grown while being treated with a particular nutrient. The sample mean and sample standard deviation of those height measurements were 43 centimeters and 10 centimeters, respectively. Assume that the population of heights of treated plants is normally distributed with mean M
A random sample of 1000 college students ages from 18-25 revealed that 234 voted for the American Idol. Similarly, 198 college students stated they voted in the 2006 midterm elections. At the 0.05 significance level, is there a difference in the proportions of students who voted for American Idol and those who voted in the 20
If we decrease the level of significance a (alpha) from 0.05 to 0.01, that means we are: A. More willing to accept a type II error; B. More willing to accept a type I error; C. Less willing to accept a type I error; D. None of the above.
A manufacturer claims that the mean lifetime,M , of its light bulbs is 51 months. The standard deviation of these lifetimes is 9 months. Ninety bulbs are selected at random, and their mean lifetime is found to be 53 months. Can we conclude, at the 0.1 level of significance, that the mean lifetime of light bulbs made by this manu
The manufacturer of the X-15 steel-belted radial truck tire claims that the mean mileage the tire can be driven before the tread wears out is 60,000 miles. The standard deviation of the mileage is 5,000 miles. The Crosset Truck Company bought 48 tires and found that the mean mileage for their trucks is 59,500 miles. Is Crosse
See attached file for full problem description. 15. Injuries to Major League Baseball players have been increasing in recent years. For the period 1992 to 2001, league expansion caused Major League Baseball rosters to increase by 15%. However, the number of players being put on the disabled list due to injury increased 32%
Two Internet Service Providers companies in the Greensboro, NC area compete for customers. In order to select the better provider, we want to test whether there is a difference in the proportion of times a customer is able to access the Internet. We have attempted to connect to the server of the first provider 500 times, and wer
The manufacturer of the ColorSmart-5000 television set claims that 95 percent of its sets last at least five years without needing a single repair. In order to test this claim, a consumer group randomly selects 400 consumers who have owned a ColorSmart-5000 television set for five years. Of these 400 consumers, 316 say that thei
A presidential candidate's aide estimates that, among all college students, the proportion p who intend to vote in the upcoming election is at most 75%. If 222 out of a random sample of 270 college students expressed an intent to vote, can the aide's estimate be rejected at the 0.01 level of significance? Perform a one-taile
1. Choose one article (link provided below) to examine and work through as an ANOVA calculation. In this regard, remember the goal will be to work through an ANOVA test to compare the means of three or more groups of data. If the article your group selected does not have enough data to complete an ANOVA calculation, please feel
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds. a. What is the value of the population year? What is the best estimate of this value? b. Explain why we need to us
1) An automobile assembly line operation has a scheduled mean completion time, mean, of 12.8 minutes. The standard deviation of completion times is 1.2 minutes. It is claimed that, under new management, the mean completion time has decreased. To test this claim, a random sample of 44 completion times under new management was tak
A manufacturer claims that the mean lifetime, mean, of its light bulbs is 52 months. The standard deviation of these lifetimes is 7 months. Ninety bulbs are selected at random, and their mean lifetime is found to be 55 months. Can we conclude, at the 0.05 level of significance, that the mean lifetime of light bulbs made by this
A manufacturer claims that the mean lifetime, mean, of its light bulbs is 50 months. The standard deviation of these lifetimes is 4 months. Ninety bulbs are selected at random, and their mean lifetime is found to be 49 months. Can we conclude, at the 0.05 level of significance, that the mean lifetime of light bulbs made by this
A short study was conducted to determine if balance could be improved with practice technique. After obtaining the length of time (in minutes) a subject can balance on 1 leg on a 12 inch wooden block, subjects were randomly allocated to 4 practice groups. Each group was taught different technique to improve balance. Subjects wer
To investigate the efficacy of a diet, a random sample of 16 male patients is drawn from a population of adult males using the diet. The weight of each individual in the sample is taken at the start of the diet and at a medical follow up 4 weeks later. Assuming that the population of differences in weight before versus after the
Use the five-step hypothesis testing procedure to solve the following exercises. 21. 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
Ms. Lisa Monnin is the budget director for Nexus Media, Inc. She would like to compare the daily travel expenses for the sales staff and the audit staff. She collected the following sample information. Sales ($) 131 135 146 165 136 142 Audit ($) 130 102 129 143 149 120 139 At the .10 significance level, can she conclude
A Large discount chain compares the performance of its credit managers in Ohio and Illinois by comparing the mean dollar amounts owed by customers with delinquent charge accounts in these two states. Two random samples of 10 delinquent accounts are selected from all delinquent accounts in Ohio and Illinois. The sample of Ohio gi
Evaluate this statement: "Without good measurement, statistical analysis is worthless." What makes it an over-generalization, or on the hand accurate as written? Provide examples to clarify.
The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 people reveals the mean yearly consumption to be 60 pounds with a standard deviation of 20 pounds. a. What is the value of the population year? What is the best estimate of this value? b. Explain why we need to
1. The manager of the Danvers-Hilton Resort Hotel stated that the mean guest bill for a weekend is $600 or less. A member of the hotel's accounting staff noticed that the total charges for guest bills have been increasing in recent months. The accountant will use a sample of weekend guest bills to test the manager's claim. A.
Using AIU's large database of survey responses from the AIU data set, complete the following: Perform hypothesis testing on one variable's data. (Choose either the intrinsic or extrinsic column.) Perform a t-test by formulating a null and an alternative statement, choosing an acceptable significance value, selecting the test s
The mean number of college credits earned in the fall by students at City University is to be estimated by determining the mean number of credits earned in the fall semester by the 100 students enrolled in statistics 202. Data (one piece of) Data (set of) Experiment Parameter Population Sample Statistic Variable A
Make a decision regarding the null hypothesis based on the sample information and interpret the results of the test, state whether we proved or disproved the null hypothesis and why the data proves this. A company needs to purchase company cars for their sales staff. They contacted their local Ford dealership and inquired as
I am looking to design something in Microsoft Access, but not sure how to do the two statistical calculations. For example, assume there are two columns of data labeled January and February. In each of these columns are the numbers 0-4. Where 0=Blank Response, 1=Poor, 2=Fair, 3=Good, 4=Excellent I want to know if th
Attached is 2 slides on powerpoint. The 1st slide is the problem and the 2nd slide is the answer format. Answer 3 is completed because it requires the use of a t test with degree of freedom that equals 11. Attached also is the excel data Please help with 1,2,4,5 and 6 only 1) eg: u=0 or u>0 etc 2) same as 1 3) answere
Please help with the 6 short questions in the attached file. For the 6th question is it Yes or No According to the historical data, the life expectancy in the US is equal to the life expectancy in the UK. A new study has been made to see whether this has changed. Records of 255 individuals from US who died recently are select
See full problem description. A leasing firm claims that mean number of miles driven annually, mu, in its leased cars is less than 12480 miles. A random sample of 16 cars a leased from this firm had a mean of 11075 annual miles driven. It is known that the population standard deviation of the number of miles driven in cars fr
The breaking strengths of cables have a mean of 1825 lbs and a standard deviation of 65 lbs. The company claims that there is an improvement in breaking strength. To evaluate this claim, 16 cables are randomly chosen and tested -- their mean breaking strength is 1859 lbs. Can we support, at the 0.05 significance level, the claim