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Quantative Analysis of Data

Statistics Problems

1. Indicate which would be the independent variable and which would be the dependent variable in each of the following: a. Score on the first test, Final grade b. Gas mileage, Car speed c. High school grade point average, Freshman College grade point average d. Crop yield, Rainfall 2. A math test was given with the foll

New Jersey Red Chickens

Experience raising New Jersey Red chickens revealed the mean weight of the chickens at five months is 4.35 pounds. The weights follow the normal distribution. In an effort to increase their weight, a special additive is added to the chicken feed. The subsequent weights of a sample of five-month-old chickens were (in pounds):

Mean Median Mode, standard deviation and probability

Question 2 The table below includes data on the number of purchases made by a sample of 50 customers. 5 6 7 8 9 5 6 7 8 9 5 6 7 8 9 5 6 7 8 9 5 6 7 8 9 5 6 7 8 9 5 6 7 8 9 5 6 7 8 5 7 5 7 5 7 5 7 7 7 7 a) Find the mean, mode, median, and standard deviation for this sample. Be sure

Empirical Rule

A samples contains 1,000 values. The histogram for this sample is bell-shaped. Approximately 950 values in the sample are known to be within $100 of the mean. Suppose the mean is $5,000. Use Empirical Rule to perform the following: a. calculate a value for the standard deviation. b. determine the data value that is 97.5 percen

Financial analysis

* Calculate the mean, median, range, variance, and standard deviation for revenues, profits, and employees. * Convert the data for each variable to a z-value, and compare BankTen to the average bank for each variable. * Identify the variable that had the greatest relative variation among the b

Standard Deviation

Using Excel, prepare a frequency distribution from the data you've been collecting. Calculate the Standard Deviation of your data. Is this a normal distribution? What are the implications?

Descriptive Statistics: Passing an Exam

A calculus instructor uses computer aided instruction and allows students to take the midterm exam as many times as needed until a passing grade is obtained. Following is a record of the number of students in a class of 20 who took the test each number of times. Students Number of tests 1

At the start of the 1999 NCAA men's basketball tournament, 64 teams were invited to compete for the national championship. Below is the number of victories that a sample of 26 of these teams had obtained during the regular season:

At the start of the 1999 NCAA men's basketball tournament, 64 teams were invited to compete for the national championship. Below is the number of victories that a sample of 26 of these teams had obtained during the regular season: 32 12 28 22 20 25 22 20 22 22 19 19 26 19 21 23 27 21 21 22 23 27 22 24 26 23 A. What is t

Forecasting

Given the following data on hotel check-ins for a 6-month period: July: 45 rooms August: 36 rooms September: 52 rooms October: 48 rooms November: 56 rooms December: 60 rooms With alpha = 0.2 and beta = 0.1, what is the adjusted exponentially smoothed forecast for September? Put your answer in the form xx.xx with no addi

Sampling Distribution of sample mean

A population consists of the four numbers {0, 2, 4, 6}. Consider drawing a random sample of size 2 with replacement. (a) List all possible samples and evaluate for each. (b) Determine the sampling distribution of X. (c) Write down the population distribution and calculate its mean μ and standard deviation σ. (

Statistics for Describing, Exploring, and Comparing Data

Degrees of Freedom: Ten values have a mean of 75.0. Nine of the values are 62,78,90,87,56,92,70,70, and 93. a. Find the 10th value. b. We need to create a list of n values that have a specific known mean. We are free to select any values we desire for some of the n values. How many of the n values can be freely assigned

Measurement Scales

For the following measurement scales, indicate the measures of central tendency that are appropriate. a. nominal scale b. ordinal scale c. interval scale d. ratio scale

Normal Distributions and Standard Deviation: Example Problems

According to the 1996 Statistical Abstract of the United States, 7.6% of the scores on the verbal portion of the Scholastic Aptitude Test (SAT) exceeded 600. Approximately, 42.3% of the cores were less than 400, according to the same reference. Assuming that scores on the verbal portion of the Scholastic Aptitude Test are approx

Statistics Problems: Standard Deviation & Regression Equation

An instructor wants to figure out if a student's score on the first exam is correlated with their score on the final exam or if they predict the final exam. Below are the figures for 10 randomly selected students from her class. (25 points) Student First Exam, Final Exam,

Quantitative Methods

The Willow Furniture Company produces tables. The fixed monthly cost of production is $8,000, and the variable cost per table is $65. The tables sell for $180 a piece. For a monthly volume of 300 tables, determine the total cost, total revenue, and profit. Determine the monthly break-even volume for the Willow Furniture

Standard Deviation & Bell-Shaped Curve

What does the standard deviation unit really represent? Is the distinction among various parts of the bell-shaped curve arbitrary or is there certain logical and rational principle involved that creates such distinctive demarcations shown in a chart like this?

How to Measure the Data That I Collected

1) Can you explain to me what categories and types of data I collected? 2) Would a frequency distribution table be appropriate for displaying my data? Please explain yes or no to help me understand. 3) Please show me how to create and submit an illustrative frequency table to show how such a table might look

Descriptive statistics and charts..

Part 1: (20 Points) Moore Travel Agency, a nationwide travel agency, offers special rates on certain Caribbean cruises to senior citizens. The president of Moore Travel wants additional information on the ages of those people taking cruises. A random sample of 70 customers taking a cruise last year revealed these ages. 57 77

Calculation of descriptive statistics and histogram in Excel.

Using the Excel program, enter the data below onto a worksheet. Then touch the Paste Function button on the toolbar. You'll get a menu. On the left side of the menu, select "Statistical." This will make the right side show all the statistical tests you can do with EXCEL. Pick "average" and it will calculate the mean, pick "stand

Statistic Problem in Business and Economics

The Appliance Center sells a variety of electronic equipment and home appliances. For the last four years the following quarterly sales (in $ millions) were reported. Quarter Year I II III IV 2000 5.3 4.1 6.8 6.7 2001 4.8 3.8 5.6 6.8 2002 4.3 3.8 5.7 6.0 2003 5.6 4.6 6.4 5.9 Determine a typical seaso

Pricing and Sales Volumes

The following uses the files EXAM.XLS and Developing_Country_Pricing.PDF. In this simulation, you are about start selling a new product, an MP3 player (YourPlayer). Management has provided you with a proforma income statement to help assess the viability of the product. They need your help to complete the income statement.

Continuous Random Variables

A. Which of these variables are discrete and which are continuous random variables? 1. The number of new accounts established by a salesperson in a year. 2. The time between customer arrivals to a bank ATM. 3. The number of customers in Big Nick's barber shop. 5. The amount of fuel in your car's gas tank. 6.The number

Basic Statistics for Business and Economics

60. Owens Orchards sells apples in a large bag by weight. A sample of seven bags contained the following numbers of apples: 23, 19, 26, 17, 21, 24, 22. a. Compute the mean number and median number of apples in a bag. _ b. Verify that (X - X) = 0. 62. The Citizens Banking Company i

Quantitative analysis questions about research article.

Answer the following questions for the attached research article (Dormire, S.L. & Reame, N.K. 2003. Menopausal hot flash frequency changes in response to experimental manipulation of blood glucose. Nursing Research 52(5): 338-343.): 1. Problem What is the problem the study was conducted to resolve? Why is the problem an i

Managerial Decision Making - Statistics Problem

The following frequency distribution reports the electricity cost for a sample of 50 two-bedroom apartments in Albuquerque, New Mexico, during the month of May of last year. Electricity Cost Frequency $80 up to $100 3 100 up to 120 8 120 up to 140 12 140 up to 160 16 160 up to 180 7 180 up to 200 4 Total 50 a. Esti

Probability Distributions - Scores

See the attached file. 1. The scores for an IQ test are normally distributed with a mean of 100 and a standard deviation of 15. If a person is selected at random, what is the probability that his IQ score will fall below 105 and will it be between 90 and 110. 2. An advertising company plans to market a product for low income

Construct the 90 percent confidence interval

A. Construct the 90 percent confidence interval for occupational prestige for respondents with only a high school diploma (N = 1,412). b. Construct the 90 percent confidence interval for occupational prestige for respondents with a bachelor's degree (N = 437). State in words the meaning of the result. c. Use these statistics