Share
Explore BrainMass

Frequency Distribution

Business Statistics: Percent Frequency & Cumulative Frequency

1. The number of sick days taken (per month) by 200 factory workers. The cumulative percent frequency for the class of 16-20 is Number of Days Frequency 0-5 120 6-10 65 11-15 14 16-20 1 2. A survey of 400 college seniors resulted in the following cross tabulation regard

Statistical Analysis

In a recent ranking of top graduate business schools in the United States published by U.S. News & World Report, data were provided on a number of attributes of recognized graduate programs. Specifically, the following variables were considered by U.S. News & World Report in establishing its overall ranking: each program's ratin

Statistics

1. Find the mean, variance, standard deviation of the binomial distribution with the given values of n and p. n=122, p=0,29 2. Use the contingency table to the right to calculate marginal frequencies and find the expected frequency for each cell in the contingency table. Assume that the variables are independent. Treatmen

Statistics: Frequency and Degrees of freedom

See attached data file. 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 shown below. What is the e

Frequency Distributions

You are the production manager for an operation that produces circuit boards. Each board is tested at the end of the manufacturing process. Rejected boards are discarded and have no future value. For product B-17, you have kept data on the number of rejects for the past 38 weeks. These data are: Number of rejected bo

Percentages and Frequency of Scores

Assume that a set of test scores is normally distributed with a mean of 100 and a standard deviation of 20. Use the 68-95-99.7 rule to find the following quantities: Suggestion: make a drawing and label first a. Percentage of scores less than 100 b. Relative frequency of scores less than 120 c. Percentage of scores less

Expected Frequencies and Goodness of Fit Test

A salesperson makes four calls per day. A sample of 100 days gives the following frequencies of sales volumes. Number of Sales 0 1 2 3 4 Observed Frequency 30 32 25 10 3 Total 100 Records show sales are made to 30% of all sales calls. Assuming independent sales

Statistics Problems 2.35, 2.51: Electric insulators, dark chocolate bars

See attached file. Please explain in detail, step by step. 2.35: The manufacturing company is Problem 2.34 also produces electric insulators. If the insulators break when in use, a short circuit is likely to occur. To test the strength of the insulators, desructive testing in high-powered labs is carried out to determine how

Frequency distribution, mean, median, mode, range, standard deviation

1. Students in a social work course received the following course grades: 83, 92, 92, 59, 72, 81, 27, 55, 70, 37, 62, 73, 71, 82, 83, 48, 96, 65, 66, 86, 79, 82, 95, 81, 96 o Create a frequency distribution for this data. o Compute the mean. o Determine the median. o Determine the mode. o Identify the range. o What is t

Constructing frequency distribution tables, histogram and curve, and key points

This is a practice exam question for my stats course that I am taking. If you would be able to help me solve this question, and with some instructions, that would be fantastic. Following is the data on the 'Left -Ventricular-Ejection-Fraction' LVEF in percent of 30 diabetic patients with abnormal cardiac condition: 68 76 7

Statistics

1. The maximum number of seats in a sample of 13 sport utility vehicles are listed below. Find the mean, median, and mode of the data 8 10 11 11 8 9 7 7 7 7 7 7 8 Find the mode. Select the correct choice below and, if necessary, fill in the answer box to complete your choice. A. The mode is _______ (Type

Frequency Tables, Distributions and Graphic Presentation

See attached for tables and data. 1) Midland National Bank selected a sample of 40 student checking accounts. Below are their end-of-the-month balances. a. Tally the data into a frequency distribution using $100 as a class interval and $0 as the starting point. b. Draw a cumulative frequency polygon. c. The bank con

Statistics: Baseball fans, binominal, poisson, and frequency distribution

1. Find P(3) when p=.70 (round to 5 places) 2. 57% of men consider themselves professional baseball fans. You randomly select 10 men and ask each if he considers himself a professional baseball fan. Find the probability that the number who consider themselves baseball fans is (a) exactly 8 (b) at least eight (c) less than 8

Basic Statistics using Excel and Eviews

See attached files for assignments. TASK1 You are required to prepare a dataset consisting of the Income (X) in £ per week and Years of Education (Y) of 40 randomly chosen adults and then perform the following exercises. (You may enter numbers representing these characteristics of fictitious individuals, provided these are

Drying rate

1. The drying rate in an industrial process is dependent on many factors and varies according to the following distribution. Minutes Relative Frequency 3 0.22 4 0.36 5 0.28 6 0.10 7 0.04 Using these random numbers 0.53; 0.65; 0.98; 0.94; 0.07; and 0.99 , sim

Statistics problem

1. An insecticide company exposes 10,000 cockroaches to its newest product, and exposes another 10,000 to their previous formula. The researchers use videotape to count how many cockroaches are still alive, and how many appear to be in distress, at 10 second intervals. When the test is completed, the researchers determine the

Statistic problems

1. Find the mean, median, and mode for the set of scores in the following frequency distribution table: X 10 9 8 7 6 5 f 2 3 5 6 3 1 2. A sample of n= 20 scores has a mean of M=6. If one person with a score of X= 2 is added to the sample, what will be the value of the new mean? 3. A sample of n =

Statistics: Grouped Data

See the attached file. Question 1: (please help me in question 1.2 to 1.5.3 and please do check 1.1, if it is correct or not) (i) A production manager at a firm recorded the outputs of the all workers in the production division during a certain shift and obtained the following results. 1496 1377 1336 1103 1284 1459 14

Frequency curves and Histogram

For normal distribution with mean = 60 and standard deviation = 6, determine the probability content of the interval [62 to 67] Question 2 The table below gives the deviation of a hypothetical portfolio's annual total return (gross of fees) from its benchmark's annual returns, for a 12-year period ending in 2003. Portf

Frequency and Probability

Use the frequency distribution, which shows the response of a survey of college students when asked, "How often do you wear a seat belt when riding in a car driven by someone else?" Find the following probabilities of responses of college students from the survey chosen at random. RESPONSE FREQUENCY Never

Statistical Charts

A manufacturing company produces electric insulators. If the insulators break when in use, a short circuit will likely occur. To test the strength of the insulators, destructive testing in high powered labs is carried out to determine how much force is required to break the insulators. Force is measured by observing how much

Frequency Distribution Chart

You are the production manager for an operation that produces circuit boards. Each board is tested at the end of the manufacturing process. Rejected boards are discarded and have no future value. For product B-17, you have kept data on the number of rejects for the past 38 weeks. These data are: Number of rejected boards.

Mid-Values and Borders of Class

See the attached file. In exercises 5 to 6, it identifies the width of class, the mid-values of class and the borders of the class for the given frequency allocations. 5) Daily minimal temperature (F) Frequency 35-40 1 40-44

Statistics for Managers Using Microsoft Excel

The data in the file protein.xls indicate fat and cholesterol information concerning popular protein foods (fresh red meats, poultry, and fish). For the data relating to the number of calories and the amount of cholestrol for the popular protein foods: a. Consruct a frequency distribution and a percentage distribution.

Frequency distribution a) Use the probability distribution to find the mean of the probability distribution. b) Use the probability distribution to find the variance of the probability distribution. c) Use the probability distribution to find the standard deviation of the probability distribution. d) Use the probability distribution to find the expected value of the probability distribution.

5. A frequency distribution is shown below. Complete parts (a) through (e). The number of dogs per household in a small town Dogs 0 1 2 3 4 5 Households 1261 438 169 46 27 11 (a) Use the frequency distribution to construct a probability distribution. (b) Find the mean of the probability distribution. (c) Find the variance

Statistical data from a pharmaceutical company

1. A pharmaceutical company conducted a study to evaluate the effectiveness and safety of a new inhaled form of insulin for the treatment of diabetes. A group of 650 diabetics was given the drug twice a day, while another group of 650 diabetics was given an inhaled placebo twice a day. Insulin levels were checked periodically