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Standard Deviation

Normally distributed Base Salary for Brand Managers

According to Salary Wizard, the average base salary for a brand manager in Houston, Texas is $88,592 and the average base salary for a brand manager is Los Angeles, California, is $97,417. assume salaries are approximately normally distributed, that the standard deviation for brand managers in Houston is $19,900, and that the

Find the standard deviation of the data

The number of homicides in Vermont from 1992 through 2001 is given in the following table. Year Homicide Victims 1992 21 1993 15 1994 5 1995 13 1996 11 1997 9 1998 12 1999 17 2000 12 2001 11 b. Find the standard deviation of the data. c. What percent of the data is within 1 standard deviation of the mean?

Plants Satisfying Demand

You have been offered a position as General Manager of a television manufacturing facility by XYZ Corporation. You have a choice of Plant A or Plant B. At the present time both plants are satisfying their demand for a particular TV (Model FX32) by providing 3200 sets per day on the average. -However, Plant A has a standard

T and Z Statistics and Pooling

Please help with the following problem. A) When does the t-statistic approximate the z-statistic? Please ask yourself this question before answering: for a probability level of 0.975 on a one-tailed probability distribution, what is z-score and what is t-statistic? Then ask yourself, when does the t-statistic approximates

Standard Deviation of SAT Scores

According to the data from the College Entrance Examination Board, scores on the SAT-I test have a mean of 1017, and Q1 is 880. The scores have a distribution that is approximately normal. Find the standard deviation, then use that result to find P99.

Empercial relation ship

Juan Salvador just completed a study of the life expectancy of 100 light bulbs and discovered that the mean time that they lasted before burning out was 1,900 hours. If the standard deviation was 150 hours, the empirical rule allows Juan to conclude that approximately 68 of the bulbs burned out between _________ and _________ ho

Statistics - Variation and Standard Deviation

A population of scores has μ = 20 and σ = 5. If every score in the population is multiplied by 2, then the new values for the mean and standard deviation would be: standard deviation = _______________ A sample of scores has M = 30 and s = 10. If 3 points are added to every score in the population, then the n

Decision Making Casino Blues

The new Lucky Lady Casino wants to increase revenue by providing buses that can transport gamblers from other cities. Research shows that these gamblers tend to be older, they tend to play slot machines only, and they have losses with a mean of $182 and a standard deviation of $105. The buses carry 35 gamblers per trip. The c

Calculating the Mean, Median, and Standard Deviation

1) The American Automobile Association checks prices of gasoline before many holiday weekends. Listed below are the self-service prices for a sample of 15 retail outlets during Labor Day weekend of 2007 in the Detroit, Michigan area. 3.44 3.42 3.35 3.39 3.49 3.49 3.41 3.46 3.41 3.49 3.45 3.48 3

Normally distributed population of heights of 10,000 women

Please answer True or False and explain why 1. For a normally distributed population of heights of 10,000 women, µ= 63 inches and ó = 5 inches. The number of heights in the population that fall between 66 and 68 inches is 1156. 2. In a normal distribution, approximately 91.31% of the area under the curve is found to

Mean, Standard Deviation

1.What does it mean for a sample to have a standard deviation of zero? Describe the scores in such a sample. 2. A population has mean, M =100 and standard deviation, s = 20. If you select a single score from this population, on the average, how close would it be to the population mean? Explain answer.

Bank of America's Consumer Spending Survey collected data on annual credit card charges in seven different categories of expenditures: transportation, groceries, dining out, household expenses, home furnishings, apparel, and entertainment ... {See the atached Question File.]

Bank of America's Consumer Spending Survey collected data on annual credit card charges in seven different categories of expenditures: transportation, groceries, dining out, household expenses, home furnishings, apparel, and entertainment ... {See the atached Question File.]

Samples for a Population of 70

If the standard deviation of a population is 70 and we want the standard error (the standard deviation of the sample mean) to be 14, what is the number of samples that we need to take?

Mean, Standard Deviation, Shape of Distribution

On the midnight shift, the number of patients with head trauma in an emergency room has the probability distribution shown below. (a) Calculate the mean and standard deviation. (b) Describe the shape of this distribution. x 0 1 2 3 4 5 Total P(x) .05 .30 .25

Capabilities and Adjustments for Packaging Process

The Crunchy Potato Chip Company sells chips in boxes with a net weight of 30 ounces per box(850 grams). Each box contains ten individual 3-ounce packets of chips. Product design specifications call for the packet-filling process average to be set at 86.0 grams so that the average net weight per box will be 860 grams. Specificati

Useful Life of a Radial Tire

The useful life of a radial tire is normally distributed with a mean of 30,000 miles and a standard deviation of 5000 miles. The company makes 10,000 tires a month. a. About how many tires will last between 25,000 and 35,000 miles? b. About how many tires will last more that 40,000 miles? c. About how many tires will

Rod Diameter Standard Deviation

Please see the attached file for the question. FIN 220 FALL 07 QUESTION 1) FROM PAST EXPERIENCE, THE POPULATION STANDARD DEVIATION OF ROD DIAMETERS PRODUCED BY A MACHINE HAS BEEN FOUND TO BE 3~ = .053 INCHES.FOR A SIMPLE RANDOM SAM

Hal recently accepted a sales position with (IBM) selling "big iron"

Hal recently accepted a sales position with (IBM) selling "big iron" (mainframe computers). He has to decide between taking a salary only or taking a smaller salary plus commissions on sales. As part of his decision-making process, he has collected historical data from previous years on the number of mainframe sales made by in

Values in Statistical Process Control

Hour Measurement in inches 1 3.010 2 3.005 3 2.990 4 3.010 5 2.995 6 2.990 7 3.000 8 2.990 9 3.010 10 3.005 11 2.995 12 2.995 13 3.010 14 3.000 15 2.990 16

Interpreting Standard Deviation

Your workplace reduces all workplace scores on a particular employee aptitude test into z-scores which are placed into a district-wide distribution of scores. Last year, your newly hired employees ranged between -1 and +2 standard deviations, and this year's newly hired employees range between -2 and +3. What do these number

Advanced Statistics Problems

1. Suppose you have invested only in two stocks, A and B. The returns on the two stocks depend on the following three states of the economy, which are equally likely to happen: State of Return on Return on Economy Stock A (%) Stock B (%) Bear

Statistics Concept for health maintenance organizations

4. A random sample of 100 light bulbs is selected. Sixty were found to burn for more than 1,000 hours. Develop a 90 percent confidence interval for the proportion of bulbs that will burn more than 1,000 hours. 5. A health maintenance organization (HMO) wants to estimate the mean length of a hospital stay. How large a sample

A. Fill in the missing values in the table. b. Is the stock of Firm A correctly priced according to the capital-asset-pricing model (CAPM)? What about the stock of Firm B? Firm C? If these securities are not correctly priced, what is your investment recommendation for someone with a well-diversified portfolio?

You have been provided the following data on the securities of three firms, the market portfolio, and the risk-free asset: Security Expected Return Standard Deviation Correlation Beta Firm A 0.13 0.12 ? 0.9 Firm B 0.16 ? 0.4 1.1 Firm C 0.25 0.24 0.75 ? The market portfolio (S&P5

Reliability, Validity of Results

1. How do you interpret the reliability results for the clerical test and work sample? Are they favorable enough for Phonemin to consider using them "for keeps" in selecting new job applicants? 2. How do you interpret the validity results for the clerical test and work sample? Are they favorable enough for Phonemin to con