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# Descriptive Statistics

### Descriptive statistics

The monthly average low temperatures* during different months of year at Denver, CO are given below: January February March April May June 5 8 18 29 40 50 July August September October November December 55 53 44 32 24 12 Source: www.weather.com Word-process your solution and answers below. a) Find the mean year

### Descriptive statistics

Below is some data from 2005 for on-the-job deaths in some dangerous jobs. Which job seems the most dangerous? Which seems the least dangerous? Explain. total deaths total employed Driver 993 3,412,370 Farmers 341

### % of batteries that has life span that is more than 2065 hours

The life span of a battery is normally distributed, with a mean of 2000 hours and a standard deviation of 30 hours. What percent of batteries have a life span that is more than 2065 hours? 1. 3% 2. 2.6% 3. 1% 4. 1.5%

### Statistics: Catagorical and Numerical Variables

1.22 The U.S. Census Bureau site, www.census.gov,contains survey information on people, business, geography, and other topics. Go to the site and click on Housing in the "People and Households" sections. Then click on American Housing Survey. a. Briefly describe the American Housing Survey. b. Give an example of a categor

### Descriptive Statistics and Inferential Statistics

In your own words explain the difference between "descriptive statistics" and "inferential statistics." Explain with example situations.

### Removing Outliers from Data

While exploring data that was collected for an investigation of resources needed for software testing and improvement, you have found an outlier. The study is focused on two variables: the number of bugs found in the code and the time (in person-hours) required to fix them. The outlier corresponds to a very large project with

### Article Summary: Consumers and Their Memory of Smell

Consumers didn't need to be told that Jazz Diet Pepsi was about to hit store shelves; they could smell it. The soft-drink company had placed an ad laced with scents of black cherry and French vanilla in the October 2006 edition of People magazine. Four months later, British travel agency Thomson Holidays sprayed its store win

### Complete the table above using Excel functions. You may also use pivot tables if you know how to (see pgs 77-80) (Those of you familiar with SPSS or Minitabs may use those programs instead) (20 pts) Answer the following using the same programs: 1) Which customer type (promotional or regular) spent the most money on average? EXPLAIN (2 pts) 2) What was the standard deviation for promotional and for regular customers? Which group had less variability in their purchases? EXPLAIN (3 pts) 3) Create a bar chart (see pgs 73-75 for histograms) for net sales for all customers. Are net sales positively or negatively skewed--EXPLAIN. Keep bar chart as part of your answer (5 pts)

PELICAN STORES Pelican Stores, a division of National Clothing, is a chain of women's apparel stores operating throughout the country. The chain recently ran a promotion in which discount coupons were sent to customers of other National Clothing stores. Data collected for a sample of 100 in-store credit card transactions at Pe

### Tournament Rounds- Decay Rate

2. Each year the local country club sponsors a tennis tournament. Play starts with 128 participants. During each round, half of the players are eliminated. How many players remain after 5 rounds? At what round does the tournament can't be played anymore? Chart the decay rate.

### Brownian Motion: Martingale Processes

Let W(t) be a Brownian motion. For each of the following processes, verify whether it is a martingale process: (1) X(t)=W^2(t)−t (2) X(t)=W^3(t)−3tW(t) (3) X(t)=t^2W(t)−2∫uW(u)du (The limit on the integral is 0 to t) (4) X(t)=W^2(t)

### How many ads of each type should the candidate for mayor use

A candidate for mayor in a small town has allocated \$40,000 for last minute advertising. He will be using two types of ads radio ads which cost \$200 per ad and reach 3,000 people and television ads which cost \$500 per ad and reach 7,000 people. In planning the campaign the manager would like to reach as many people as possible b

### Finding Sampling Errors

There are 4 samples of 40 individuals each interviewed to find out how often they visit a fast food restaurant in the week. The averages of each sample were 2.5, 3.4, 2.3 and 3.0. If the average is 2.85 and its standard deviation is 50 and we assume that the population is normally distributed. a) Find the sampling error for e

### Descriptive Statistics and hypothesis testing

1. Suppose that a broad cross section of high school students took a very difficult scholarship exam and almost all scored very low but a very small number scored very high. When plotted as a curve, the distribution will show what type of skew? 2. Which type of distribution is often found in the nature? 3. What is the form

### Percentage of the students will have a grade point average of 3.5 or better

The grade point average of students at a university is normally distributed, with a mean of 2.6 and a standard deviation of 0.6. A recruiter for a company is interviewing students for summer employment. What percentage of the students will have a grade point average of 3.5 or better?

### Normally distributed random variables

X is a normally distributed random variable with a mean of 12 and a standard deviation of 3. The probability that X equals 19.62 is ?

### Productivity and Variables

Many people attend work and produce little or nothing of value that is why they are terminated. attendance + work quality = productivity. Can you think of other variables that influence productivity

### Descriptive Statistics and Probability calculations in Minitab.

Sect. 5-2, p. 209 Identifying Probability Distributions. In Exercise 7-12, determine whether a probability distribution is given. In those cases where a probability distribution is not described, identify the requirements that are not satisfied. In those cases where a probability distribution is described, find its mean and

### Scale of Measurement

Identify the scale of measurement in each of the following: a. attitudes toward school b. grouping students on the basis of hair color c. asking judges to rank order students from most cooperative to least cooperative

### Frequency Distribution

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 last year. a. Estimate the mean cost. b. Estimate the standard deviation. c. Use the Empirical Rule to estimate the proportion of costs within two standard deviations

### Growth Rate of Computer Stocks

1. a. Computer stocks currently provide an expected rate of return of 16%. Dell, a large computer company, will pay a year-end dividend of \$2 per share. If the stock is selling at \$50 per share, what must be the market's expectation of the growth rate of Dell dividends? 1. b. If dividend growth forecasts for Dell are revised

### Cost-benefit Analysis and Related Topics

Assignment #8: Cost-benefit Analysis and Related Topics 1. Suppose you are the primary decision-maker (with input from the board, of course) in the healthcare corporation known as Medical Care at Your Doorstep (MCYD). The clinics operated by MCYD are located in areas that underserved by hospitals and the mission of

### Solving Descriptive Statistics and Probability Problems

See the attached file. Question 1: Gregor Mendel crossed two breeds of peas and examined the crop. He found 892 wrinkled green peas, 378 smooth green peas, 618 wrinkled yellow peas, and 241 smooth yellow peas. a. If he picked a smooth pea at random from his crop, what is the probability that it was yellow? b. If he p

### Value of Interquartile Range

A monthly report to the Texas Department of Health, division of Water Hygiene, contained the following water production data in thousands of gallons: 5263 5636 5264 4395 6090 5293 4668 5725 5171 4378 5118 5538 4838 5167 5119 5438 6843 5262 4653 5303 5913 4570 5142 5964 6431 4719 5358 6043 4554 5805 What is the value

### Qualitative and quantitative variables

Refer to the Wage Data that is in the attachment, which reports information on annual wages for a sample of 100 workers. Also included are variables relating to industry, years of education, and gender for each worker. (a) Which of the 12 variables are qualitative and which are quantitative? (b) Determine the level of measu

### Normal Distribution with mean value and standard deviation value

The scores of males on the 2008 Mathematical Scholastic Aptitude Test (MSAT) were approximately normally distributed with mean µ = 500 and standard deviation σ = 100 points (approximately). Find the proportion of males who received the following scores. a. Between 500 and 600 b. Between 400 and 600

### Statistics - Descriptive Statistics (Analysis of Variance)

Car Fuel Consumption: The following table lists highway fuel consumption amounts (in mi/gal) from data Set 22 in Appendix C. Assume that fuel consumption amounts are not affected by an interaction between the type of transmission (manual or automatic) and the number of cylinders. Are fuel consumption amounts affected by the

### Important Information About Exponential and Reciprocal Functions

Using a present value table, your calculator, or a computer program present value function, answer the following questions. Assistance is needed with the formula to calculate the problems: Required: a. What is the present value of nine annual cash payments of \$4,000, to be paid at the end of each year using an interest rate

### Estimating Single Population Parameters

A 2005 article written by Will Lester of the Associated Press reported on a poll in which 80% of those surveyed say that American who currently own a SUV (sport utility vehicle) shoudl switch to a more fuel-efficient vehicle to ease America's dependency on foreign oil. As a follow up to this report a consumer group conducted a

### Type of measurement scales for each variable

Determine the types of measurement scales for each variable (Nominal, Ordinal, Interval, Ratio): 1) Name 2) Gender 3) Absences 4) Physical Education (PE) 5) Math 6) Writing 7) Reading