A pesticide control company wants to compare the effectiveness of two pest control chemicals (call then A and B) with respect to their ability to kill ants. An experiment is conducted as follows: 2000 ants are selected at random. 1000 are selected and placed in a room labeled A The remaining 1000 are placed in a room la
Refer to the real estate data which reports information on homes sold in Denver Colorado last year. a. A recent article in Denver post indicated that the mean selling price of the homes in the area is more than $220,000. can we conclude that the mean selling price in the Denver area is more than $220,000. Use the .01 sign
The quality control manager for ENTA Inc. must decide whether to accept (a1), further analyze (a2), or reject (a3) a lot of incoming material. Assume the following payoff table is available. Historical data indicates that there is a 30% chance that the lot is poor quality (s1), a 50 % chance that the lot is fair quality (s2), an
Using the same data set used for you Hypothesis Testing Paper in Week Two, paper describing a new hypothesis test using a different statistic (e.g., large sample size, small sample size, means and/or proportions, one-and two-tailed tests) that you can perform on that data. Formulate a new hypothesis statement and perform the fiv
Please see the attached for the two homework problems. Data is attached as well for each problem. 62. Refer to the Real Estate data, which reports information on the homes sold in Denver, Colorado last year. a. A recent article in the Denver Post indicated that the mean selling price of the homes in the area is more than $
1. The management of White Industries is considering a new method of assembling its golf cart. The present method requires 42.3 minutes, on the average, to assemble a cart. The mean assembly time for a random sample of 24 carts, using the new method, was 40.6 minutes, and the standard deviation of the sample was 2.7 minutes. Usi
1. 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. 1. What is the value of the population mean? What is the best estimate of this value? 2. Explain why we need to use
PiggyBank has narrowed its options down to two incentive plans: A. cash back when the consumer makes an online purchase; and B. cash back when the consumer makes a purchase at a clothing store. The bank doesn't know whether consumers would shop online more than at clothing stores. Information Experts has placed you in a grou
1. When we say we have a confidence level of 95%, what do you think our "margin of error" is? 2. If we move the level of confidence from 95 to 99%, what will happen to our margin of error? What will happen to the width of our confidence interval? 3. Would we have gotten a better feel for the amount of flour needed if we'd
1. Using the internet (or other outside source), research a health related variable such as newborn weight or heart rate (although you may not use these since they have already been discussed in class). Based on the information you discover (such as mean, median, typical range, etc.), would you say that your variable has a norm
Note: Methods of computation could include the usage of Excel®, SPSS®, Lotus®, SAS®, MINITAB®, or by hand computation. Chapter 12: Exercises 10 & 11 10) The manager of a computer software company wishes to study the number of hours senior executives spend at their desktop computers by type of industry. The manager sel
Using the same data set used for you Hypothesis Testing Paper last week, describe a new hypothesis test using a different statistic (e.g., large sample size, small sample size, means and/or proportions, one-and two-tailed tests) that you can perform on that data. Formulate a new hypothesis statement and perform the five-step hyp
14) (a) state the decision rule, (b) compute the pooled estimate of the population variance, (c) compute the test statistic, (d) state your decision about the null hypothesis, and (e) estimate the p-value. The null and alternate hypotheses are: A random sample of 15 observations from the first population revealed a sampl
There used to be an ad on TV that claimed one toothpaste was proven to be more effective in fighting tooth decay than another. One of statistics professors was interested in the study, and after 6 ads finally got the address to write away for it from the TV. The study was classically perfect - randomly assigned individuals i
Fairfield Homes is developing two parcels near Pigeon Fork, Tennessee. In order to test different advertising approaches, they use different media to reach potential buyers. The mean annual family income for 75 people making inquiries at the first development is $150,000, with a standard deviation of $40,000. A corresponding sam
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 recorded. Salesperson Before After Sid Mahone $320
For the attached hypotheses test, please assume and complete all of the missing information for the data set and do the 5-step hypothesis test: 1. Set your hypotheses 2. Calculate the observed value of the statistic 3. Calculate the critical value of the statistic 4. Make your decision 5. Draw your conclusion
I need to write an evaluation of a research article (article attached). It needs to include a brief description of the article and follow a systematic approach. Article attached -- it tests the hypothesis that attitudes towards HIV/AIDS will improve after participation in an educational program.
What are the theoretical considerations of hypothesis testing and why are these considerations important when conducting research studies? Define statistical comparisons, correlations and predictions as they relate to social science research. What role do they play in the data collection process?
Please help! I'm struggling with statistics. Attached are problems that I need help with. Please include an explanation to the problems, so that I can get a better understand of how to solve them. Exercise 12 The American Sugar Producers Association wants to estimate the mean yearly sugar consumption. A sample of 16 pe
The following data resulted from a taste test of two different chocolate bars. The first number is a rating of the taste, which could range from 0 to 5, with a 5 indicating the person liked the taste. The second number indicates whether a "secret ingredient" was present. If the ingredient was present a code of "1" was used, and
I recently completed a survey concerning whether or not cell phone usage on airplanes will lead to air rage or not. I have the results from the survey in excel fomat but I am not sure how to complete a one tailed t test for the questions. I am trying to show the surveyed people say that they wii become irritated by prolonged cel
See the attachments for the complete descriptions of the questions. 1.) A toy manufacturer claims that the mean time that its top-selling toy captures children's attention is at least 35 minutes. Suppose that we doubt this claim and we carry out a hypothesis test to see if we can refute the claim. State the null hypothesis
Let's say you want to know if the amount of candy adults eat influences the number of times they brush their teeth in a day. Your independent variable is candy - you will manipulate how many pieces of candy they eat. Your dependent variable is the number of times they brush their teeth in a day. This is a ratio scale: they can b
Please see sample problem in attachment. --- Consider the following hypothesis test H0: mu1 - mu2 = 0 Ha: mu1 - mu2 =/ 0 The following results are for two independent samples taken from the two populations. Sample 1 Sample 2 n1 = 80 n2 = 70 mu1 = 104 mu2 = 106 s1 = 8.4 s2
We want to test the claim that the Smith method of gender selection is effective in increasing the likelihood that a baby will be born a girl. In a random sample of 80 couples who use the Smith method, it is found that among the 80 newborn babies, there are 35 girls. What should we conclude about the claim? Why is it nece
I have to do a paper that would identify a research issue, problem, or opportunity that uses data that has absolute zero measurements, such as interval and ratio level data. I chose the temperature in my city over the course of a month, what would be the issue, problem or opportunity with weather over the course of a month. I ne
The Holland wood company manufacturers and assembles desks and other office equipment at several plants in Michigan. The weekly production of the Model A3 desk at the Grand Rapids Plant is normally distributed with a mean of 200 and a standard deviation of 16. Recently, due to market expansion, new production methods have be
I have 2 samples that I must compare using the 5% level of risk. Population One - Sample Size 45, mean income $31,290, SD $1,060 Population Two - Sample Size 60, mean income $31,330, SD $1,900 I would assume that I would run a Chi-Square for independent means but I need the population variance do I not before I can do any
I have to identify a research issue, problem, or opportunity that uses data that has absolute zero measurements, such as interval and ratio level data. What if I choose the temperature in my city over the course of a month. What would be the issue, problem or opportunity with weather over the course of a month?