A university's associate directors for whom a statistician was consulting were interested in alumni donations, as are many schools, not only because they want the money but also because it is one of the criteria by which U.S. News & World Report ranks U.S. institutions of higher learning. U.S. News includes this criterion becaus
Task: You run a small Internet business and are concerned about customer support service levels on the Help Desk. You want to know how many calls per day are handled by your help desk staff. You collect the data at left over a 90-day period. Use appropriate descriptive statistics to make sense of this data. Use an appropriate g
1. Calculate the mean for samples where: a. n=10 sum of x=85 ? b. n= 16 sum of x = 400 ? c. n =45 sum of x =35 ? d. n=18 sum of x =242 ? 2. Calculate the mean, median, and mode for each of the following samples: a. 7, -2, 3, 3, 0, 4 b. 2, 3, 5, 3, 2, 3, 4, 3, 5, 1, 2, 3, 4 c. 51, 50, 47, 50, 48, 41, 59, 68, 45,
The length of the first 10 words of 2 books are listed below. Find the range, variance, and standard deviation for each of the two samples, then compare the two sets of results. Does there appear to be a difference in variation? Book 1 4 6 2 3 5 6 4 3 4 2 Book 2 12 6 11 10 9 8 10 10 4 10 Find the range for Book 1 Range =
1. Given the following revenue and cost function for a business firm, calculate the break-even quantity, total revenue, total cost and total profit at break-even level of production. revenue function R = F(Q) = 4q total cost C = F(Q) = 12 + 2q 2. Given the following r
Consider the Oil Spill data and the variable "symptoms", a measurement of symptom severity that ranges from 0 (no symptoms) to 40 (most severe symptoms). 1) Create a histogram showing the distribution of symptom scores in this sample. Is this a skewed distribution? If so, is it skewed to the left or to the right? 2) Prov
1. True or false? The median is the only measure of central tendency that can be used to describe data at the nominal level of measurement. 2. True or false? If a vertical line is drawn through the middle of a distribution and both halves are approximately mirror images, the distribution may still be classified as symmetric.
I need help determining infant mortality rates in the U.S. I have to gather data about infant mortality rates in various countries and identify the ten that have the lowest infant mortality rates I also, have to find the infant mortality rate in the U.S. and find where the U.S. ranks internationally. Third, I need to find t
Adele Weiss manages the campus flower shop. Flowers must be ordered three days in advance from her supplier in Mexico. Advance sales are so small that Weiss has no way to estimate the demand for the red roses. She buys roses for $15 per dozen and sells them for $40 per dozen. The pay-off table for the problem is given below.
Using the following project information (Times are estimates in weeks): Activity Optimistic Time Most Likely Time Pessimistic Time Immediate Predecessor(s) Variance Expected Time A 3 6 9 none 1
Now using Excel, prepare a frequency distribution from the data you collected in Module 1. Calculate the Standard Deviation of your data. Is this a normal distribution? What are the implications? I am having trouble with this frequency distribution, I am not sure how to set this up. Any help that you could provid
Solve the following problems showing your work: 1. In a poll, respondents were asked whether they had ever been in a car accident. 157 respondents indicated that they had been in a car accident and 117 respondents said that they had not been in a car accident. If one of these respondents is randomly selected, what is the prob
I need help identifying variables and conducting t-tests and chi-squared tests and how to use Excel to calculate the data. Identify three continuous and three discrete variables and describe their distribution numerically (e.g., central tendency, spread) as well as graphically. Compare the results. Using the variables select
Find an example of statistics in the news to discuss the following statement that represents one of the objectives of statistics analysis: "Statistics helps us make decisions based on data analysis." Briefly discuss how the news item or article meets this objective. Cite your references.
Your specific assignment for this week is to select a type of quantitative data to collect from your own life. How many minutes does it take yo to get to work everyday. In a brief paper, describe the data you are going to collect. Start collecting data today so you have can have at least 10 observations, preferably mor
A sample of nine students is selected from among the students taking a particular exam. The nine students were asked how much time they had spent studying for the exam and the responses (in hours) were as follows: 18, 7, 10, 13 12, 16, 5, 20, 21 Estimate the mean study time of all students taking the exam. Round your a
1. The researchers analyzed the data they collected as though it were at what level of measurement? a.Nominal b.Ordinal c.Interval/ratio d.Experimental 2. What was the mean posttest empowerment score for the control group? 3. Compare the mean baseline and posttest depression scores of the experimental group. Was this a
Show all your work Problem 1) A sample of nine students is selected from among the students taking a particular exam. The nine students were asked how much time they had spent studying for the exam and the responses (in hours) were as follows: 18, 7, 10, 13 12, 16, 5, 20, 21 Estimate the mean study time of all students
I need some help with the following: Hunter Chemical Company claims that its major product contains on the average 4.0 fluid ounces of caustic materials per gallon. It further states that the distribution of caustic materials per gallon is normal and has a standard deviation of 1.3 fluid ounces. a. What proportion of the
Interpreting Basic Statistics You have been recently hired as a marketing analyst in an advertising agency. You are assigned the task of assessing the impact of direct marketing promotions. Your goal is to provide a valid assessment of the performance of individual campaigns, as well as objective and reliable cross-campaign c
When coaching or training athletes, the tests used to predict performance or determine training methods that incorporate statistical methods. Why are these methods so effective?
Question 1 You are a manager working for an insurance company. Your job entails processing individual claims filed by policyholders. In general, few claims are expensive. Each quarter, you compile a report summarizing key claim statistics, such as the number of claims submitted, the average cost per claim, and the total cost
What are some concepts behind variance analysis? Why is it important to test for variances in your data? Explain. How is variance analysis used in health care administration? Provide an example. Please provide references.
The following are quality control data for a manufacturing process at Kensport Chemical Company. The data show the temperature in degrees centigrade at five point in time during a manufacturing cycle. The company is interested in using control charts to monitor the temperature of its manufacturing process. Construct the R chart.
Fresh fruit prices and quantity data for the years 1988 to 2001 follow (Statistical Abstract of the United States, 2002). Quantity data reflect per capita consumption in pounds and prices are per pound. Fruit 1988 per Capita Consumption (pounds) 1988 Price ($/pound) 2001 Price ($/pound) Bananas
Why do you think it is important to describe both the measure of central tendency and the measure of dispersion when talking about a data set?
The following were collected for the Master Blend Coffee production process. The data show the filling weights based on samples of 3-pound cans of coffee. Use these data to construct the ? and R charts. What conclusions can be made about the quality of the production process?
Question 1: The CEO has asked you to do some basic statistical analysis of the theaters, looking at the relationship between some basic theatre-specific/demographic factors and theatre revenue. Most of the data is fairly easy (though time consuming and expensive) to get, but some members of your team are concerned about the di
Consumer Research, Inc., is an independent agency that conducts research on consumer attitudes and behaviors for a variety of firms. In one study, a client asked for an investigation of consumer characteristics that can be used to predict the amount charged by credit card users. Data were collected on annual income, household
Descriptive statistic results from quarterly sales figures over a 18 year period (73 qtr) are below. Please interpret the standard Deviation and Median in terms of sales results, so I can explain the sales in written form. Table 1 Net Sales (in thousands) Mean = $6,343,231 Median = $6,348,797 Standard Deviation = $2,473,