Explore BrainMass

Explore BrainMass

    Descriptive Statistics

    BrainMass Solutions Available for Instant Download

    Contingency Table Approach and Probability

    A laptop computer manufacturer sells a computer with a particular configuration. The manufacturer conducted a study on purchase intentions of consumers for this particular laptop with varying potential attributes. From the study it was found that 45% of consumers wanted a faster processor. 55% wanted a larger screen and 40% want

    Probability and Marketing

    A local beer company sells two types of beer, a regular brand and a light brand with 30% fewer calories. The company's marketing department follows its traditional strategy of targeting women beer drinkers with light beer and men beer drinkers with regular beer. To test the rationale for this strategy an intern at the company ra

    Conduct hypothesis testing for the mean of two populations

    Please help to answer questions A-D in the attachment. For questions A and B, would you use the use the t-test two sample assuming equal variances function? If not, what would you use? I'm not sure what the graphical method is to answer question C. What is it and how do you create it? Please show your calculations in exce

    Statistics: Normal Probability

    Please assist with the following question. Thanks in advance for your help! As players' salaries have increased, the cost of attending baseball games has increased dramatically. The file attached (BBCOST) contains the cost of four tickets, two beers, four soft drinks, four hot dogs, two game programs, two baseball caps, and t

    Estimating the mean difference in weight gain

    Based on a survey of 1,000 adults by Greenfield Online and reported in a May 2009 USA Today Snapshot, adults 24 years of age and under spend a weekly average of $35 on fast food. If 200 of the adults surveyed were in the age category of 24 and under and they provided a standard deviation of $14.50, construct a 95% confidence int

    Hypothesis (Additional Help)

    Using the telephone numbers listed in your local directory as your population, randomly obtain 20 samples of size. I have attached these numbers in an excel sheet. From each telephone number identified as a source, take the fourth, fifth, and sixth digits. a. Calculate the mean of the 20 samples b. Draw a histogram showing the

    Predicting Price from Capacity

    2. Disk drives have been getting larger. Their capacity in now often given in terabytes (TB) where 1 TB = 1000 gigabytes, or about a trillion bytes. A survey of prices for external disk drives found the following data: Capacity (in TB) Price (in $) .080 29.95 .120 35.00 .200 299.00 .250 49.95 .320 69.95 1.0 99.00

    Statistical analysis relating to human resources

    20. Although controversial and the subject of some recent lawsuits, some human resource departments administer standard IQ tests to all employees. The Stanford-Benet test scores are well modeled by a Normal model with mean 100 and standard deviation 16. If the applicant pool is well modeled by this distribution, a randomly sele

    ANOVA Table and Null Hypothesis Testing

    The attached data resulted from an experiment that utilized a completely randomized design, Complete the ANOVA table. I have attached the answer in table format as well; I want to understand how the answers were obtained and also test the null hypothesis. Treatment 1 Treatment 2 Treatment 3 3.3 5.1

    Constructing a Cummulative Percentage Distribution

    The following data represents the amount of soft drink in a sample of 50, 2 liter bottles (the data file with the info has also been attached): I need help: 1. Constructing a cumulative percentage distribution. 2. Based on the results of (a) and (b), does the amount of soft drink filled in the bottles concentrate around spe

    Normal probability distribution of investments

    An investment broker reports that the yearly returns on common stocks are approximately normally distributed with a mean return of 12.4 percent and a standard deviation of 20.6 percent. On the other hand, the firm reports that the yearly returns on tax-free municipal bonds are approximately normally distributed with a mean retur

    Small Business Index Survey

    Chapter 3 18 The U.S. Fish and Wildlife Service plans to study the fishing industry around Saginaw Bay. To do that, they decide to randomly select 5 fishing boats at the end of a randomly chosen fishing day and to count the numbers and types of all the fish on those boats. a) what kin

    ANOVA Study on Egg Housing Systems

    A study of four different types of egg housing systems was performed. The four egg housing systems were cage, barn, free range, and organic. In addition to housing system, the researchers also determined the weight class (medium or large) for each sampled egg. The data on whipping capacity (percent overrun) for the 28 sampled e

    Statistics Data Set

    1. The following data set represents the repair costs (in dollars) for a random sample of 30 dishwashers. 41.82 52.81 57.80 68.16 73.48 78.88 88.13 88.79 90.07 90.35 91.68 91.72 93.01 95.21 95.34 96.50 100.05 101.32 103.59 104.19 105.62 111.32 117.14 118.42 118.77 119.01 120.70 140.52 141.84 147.06 (a) Find the point esti

    Calculating house prices with sample statistics

    Hi, I want the answers for: 1-The mean price of new homes from a sample of houses is $155,000 with a standard deviation of $15,000. The data set has a bell-shaped distribution. Between what two prices do 95% of the houses fall? Refer to the sample statistics of Exercise 5 and use z-scores to determine which, if any, of th

    Creating null and alternative hypotheses

    Question 3 State the null and alternative hypotheses for each of the following: a. You want to show an increase in buying and selling of single-family homes this year when compared with last year's rate. b. You are testing a new recipe for "low-fat" cheesecake and expect to find that its taste is not as good as traditional ch

    Normally Distributed Grades

    See the attachments. Exercises 2.16, 2.20, 2.24, 2.26 (b, d) Exercises 4.10 (a,d), 4.14, 4.20, 4.24, 4.32, 4.42, 4.50.

    Surveys, sampling method and categorical data

    Chapter 3 & 4 Sample Problems Chapter 3 5. GFK Roper Consulting conducts a global consumer survey to help multinational companies understand different consumer attitudes throughout the world. In India, the researchers interviewd 1000 people aged 13-65 . Their sample is designed so that they get 5

    calculating probability and checking independence

    Chapter 7 Sample Problems 41. A company has recently replaced their e-mail server because previously mail was interrupted on about 15% of workdays. To see how bad the situation was, calculate the probablity that during a 5-day work week, there would be an e-mail interruption. A) On Monday and again on Tuesday?

    Determining the sample size in the given case

    If the manager of a paint supply store wants to estimate the mean amount of paint in a 1-gallon can to within +/- 0.004 gallon with 95% confidence and also assumes that the standard deviation is 0.02 gallon, what sample size is needed? Please answer in excel using functions.

    Confidence Interval Estimate: Social Media Example

    In a survey of 1200 social media users, 76% said okay to friend co-workers, but 56% said it is not okay to friend co-workers. (Data extracted from "Facebook Etiquette at work," USA Today, March 24, 2010, p.1B). a. Construct a 95% confidence interval estimate for population proportion of social media users who would say it is

    Relationship: Correlations and Regressions

    Your final project entails systematic extraction of decision-aiding insights from a dataset (SampleDataSet.xlsx) provided to you in the Doc Sharing area. The goal of this project is to provide you with hands-on experience in conducting and interpreting different types of statistical analysis. The focus of your analysis will be o

    ADVERTISEMENT