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# Quantative Analysis of Data

### Estimate and Interpret a Population Variance

See the attached file. With the data below can you tell me how I would estimate and interpret a population mean with the population standard deviation unknown. Title Gross (\$) in Millions Aliens 81.843 Armageddon 194.125 As Good As It Gets 147.54 Braveheart 75.6 Chasing Amy 12.006 Contact 100.853 Dante's Peak 67.

### Survey on Population of American Intellectual Union

Details: The data set for our course is a sample of a survey conducted on the population of the American Intellectual Union (AIU). It is available via the following link: DataSet with DataSet Key which contains the following nine sections of data that will be used throughout our course: (1) Gender (2) Age (3) Department (4)

### Measuring Central Tendency

This Discussion will give you the opportunity to calculate or identify the three measures of central tendency. Select an appropriate real life situation where one measure would be more appropriate than the other two measures of center. a. Select a common topic or hypothesis and record the topic in your posting, for exa

### Determining Percentage of Population that is Non-Diabetic

Fasting blood glucose levels range from 4.2- 5.8mmol/L. Suppose the mean fasting glucose level for the Canadian population is 5.00mmol/L. If the standard deviation is 0.6 and we use 7.0 as our definition of diabetes, what percentage of the population would be non-diabetic?

### Standard deviation when performing a t-test

Why is it not necessary to have/use a standard deviation when performing a t-test but you need one with a z-test? If you were to add one step to better understand the five-step process, what would that be? How would it make the calculations, or process, easier?

### 3 statistic problems: percentile, box and whisker plots, interquartile range, quartiles, outliers

1. Grades: Test scores: Clayton and timothy took different sections of Introduction to Economics. Each section had a different final exam. Timothy scored 83 out of 100 and had a percentile rank in his class of 72. Clayton scored 85 out of 100 but his percentile rank in his class was 70. Who performed better with respect to th

### TRUE OR FALSE , MULTIPLE CHOICE, CONFIDENCE INTERVAL

TRUE OR FALSE 1._____The arithmetic mean is the sum of the observations divided by the total number of observations. 2._____There are always as many values above the mean as below it. 3._____The standard deviation is the positive square root of the variance. It is a measure of dispersion in the same units as the ori

### Example Questions and Answers in Statistics

Question 2: All 6 members of a family work. Their hourly wages (in dollars) are 18, 26, 31, 10, 13, 40 Assuming that these wages constitute an entire population, find the standard deviation of the population. Round your answer to at least two decimal places. Question 3: Petroleum pollution in oceans stimulates t

### Qualitative or Quantitative ...

Identify the population and the sample: A survey of 787 small-business managers found that 72% are optimistic about the future of their company. Determine whether the numerical value describes a parameter or a statistic: 19% of a sample of Indiana 9th graders surveyed smoked cigarettes daily. Determine whether the data are q

### A test to measure depression is assessed.

Dr. Zak developed a test to measure depression. He sampled 100 university students to take his five item test. The group of students was comprised of 30 men and 70 women. In this group, four persons were Aftican American, six persons were Hispanic, and one person was Asian. Zak's Miraculous Test of Depression is printed below:

### Expected return and standard deviation....

The probability the economy will contract is 0.2, the probability of moderate growth is 0.6, and the probability of a rapid expansion is 0.2 If the economy contracts, the expected retun on the portfolio is 5%. Moderate growth will have an 8% return, and rapid expansion will return 15%. What is the expected return? What is

### Statistics: The Mean Diastolic Blood Pressure

Confidence interval for the population mean: Use of the standard normal Scenario: The mean diastolic blood pressure for a random sample of 90 people was 92 millimeters of mercury. If the standard deviation of individual blood pressure readings is known to be 12 millimeters of mercury, find a 90% confidence interval for the tr

### Statistics and Excel Formulas: Service Times

The manager of a fast-food establishment periodically monitors various aspects of its operations, including service time, i.e., the time (in seconds) between placing and receiving an order. Below are the service times for a sample of 48 recent drive-through customers. 84 78 76 95 84 101 91 78 121 99 104 95 74 8

### Qualitative variable and quantitative variable

Can you please provide one example of a Qualitative data and one example of a Quantitative Data that you face daily? Please explain why it is a Quantitative or Qualitative data and describe the scale of measurement .

### Computing mean, median, mode, variance, standard deviation

1. The ages of all the patients in the isolation ward of the hospital are 38, 26, 13, 41, and 22. What are the population mean, variance, and standard deviation? 2. The weights of a sample of seven FedEx shipments, to the nearest pound, are 10, 7, 11, 10, 13, 5, and 4. Compute the sample mean, the median, and the moda

### Is there a difference in the mean allowances nationally and the mean allowances in northwestern Ohio for nine-year-olds?

In a recent national survey, the mean weekly allowance for a nine-year-old child from his or her parents was reported to be \$3.65. A random sample of 45 nine-year-olds in northwestern Ohio revealed the mean allowance to be \$3.69 with a standard deviation of .24. At the .05 level of significance, is there a difference in the me

### Quantitative methods - Expressing Constraint into algebraic expressions

Please see attached document for complete details, some of the signs may not print here. 1. Constraint Assume that x2, x7 and x8 are the dollars invested in three different common stocks from New York stock exchange. In order to diversify the investments, the investing company requires that no more than 60% of the dollars i

### Central tendency, skewed distributions, discrete and continuous probability distributions, and standard normal distributions

Question 1: When is the mean the best measure of central tendency? When is the median the best measure of central tendency? Explain. Questions 2: A researcher has determined that the distribution of annual salaries of NBA players is bell-shaped and symmetrical about the mean salary, do you think that introducing Michael

### The Bookstall, Inc., is a specialty bookstore concentrating on used books sold via the Internet. Paperbacks are \$1.00 each, and hardcover books are \$3.50. Of the 50 books sold last Tuesday morning, 40 were paperback and the rest were hardcover. What was the weighted mean price of a book?

The Bookstall, Inc., is a specialty bookstore concentrating on used books sold via the Internet. Paperbacks are \$1.00 each, and hardcover books are \$3.50. Of the 50 books sold last Tuesday morning, 40 were paperback and the rest were hardcover. What was the weighted mean price of a book?

### Calculating Dispersion and Confidence Intervals

Gas Price Gas Price Gas Price \$3.76 \$3.99 \$4.25 \$3.79 \$3.99 \$4.25 \$3.79 \$4.00 \$4.25 \$3.80 \$4.00 \$4.25 \$3.81 \$4.03 \$4.25 \$3.82 \$4.05 \$4.29 \$3.84 \$4.05 \$4.29 \$3.85 \$4.07 \$4.29 \$3.86 \$4.08 \$4.29 \$3.87 \$4.09 \$4.29 \$3.87 \$4.09 \$4.36 \$3.87 \$4.09 \$4.36 \$3.89 \$4.09 \$4.36 \$3.89 \$4.11

### Temperature measuring output of a production process

Temperature is used to measure the output of a production process. When the process is in control, the mean of the process is µ = 128.5 and the standard deviation is σ = .4. a.Construct the x¯ chart for this process if samples of size 6 are to be used. b.In the process in control for a sample providing the following da

### Measures of central tendency, dispersion, and skew for your data

Calculate the measures of central tendency, dispersion, and skew for your data

### Quantitative methods - Sensitivity

Please see attached 3 problems. Here's the process I want you to use to answer sensitivity questions. For attached problems, please copy and paste the sensitivity report from QM for Windows. ? Determine if the change is within the permitted boundaries. If it is, the answer to your question can be found within the data.

### A Comparison of Mean and Variance

Why is the mean not enough for us to understand our data, why do we need to comprehend variation as well?

### Statistical Analysis - Using the Wateruse data set analyze the data using Excel, MegaStat or whatever statistical software you prefer and report in proper statistical form/jargon about the dataset. ...

Using the Wateruse data set analyze the data using Excel, MegaStat or whatever statistical software you prefer and report in proper statistical form/jargon about the dataset. ... [See attached question file.]

### Mean and Standard Deviation of Data

0 0 5 10 14 16 32 38 40 44 78 86 99 142 175 176 202 220 301 400 A) What is the mean? B) What is the Standard Deviation C) What percent of data fall between minus 2 and plus 2 standard deviations of the mean? How does this compare to the Empirical Rule?

### Sample Functions: The Mean Value of the Random Variable

The random number generator in a computer generates three-digit numbers that are uniformly distributed between 0.000 and 0.999 at at rate of one random number per second starting at t=0. A sample function from a random process is generated by summing the 10 most recent random numbers and assigning this sum as the value of the s

### Standardized Scores: z-score, percentile rank, t-score, SAT score, stanine score

1. Given a mean of 60, with a standard deviation of 12, and with a raw score of 75, find: (a) the z-score (b) percentile rank (c) t-score (d) SAT score (e) stanine score 2. Sammy Slicko bets that he can flip a coin and come up heads every time. At what point in the coin toss (5 in a row, 6 in a row, or 7 in a row), ca

### Develop research question and formulate research hypothesis

Using ratio or interval numerical data, develop one research question from which to formulate a research hypothesis. (hypothesis test of one population mean or population proportion) Need to: a-formulate both a numerical and verbal hypothesis b-perform the five-step hypothesis test on data set b-describe the result of th

### Unemployed Workers - Median, Mode and Standard Deviation

The numbers of unemployed workers (in millions) from 1992 to 2001 are recorded below. 9.61 8.94 8.00 7.40 7.24 6.74 6.21 5.88 5.66 6.74 a) (8) Compute the median and mode number of unemployed workers b) (2) Is there a mode? c) (6) Compute the standard deviation of the number of unemployed workers.