Given a sample of 50 IQ scores ranging from 80 to 145, if the 145 were accidentally typed in error as a 415, what would be the impact on the following statistics? (Answer with increase, decrease or remains the same.) The mean. The median. The standard deviation. The range.
-1, 0, 2, 3, 7, 10, 10 The standard deviation of the data above is (to the nearest 1/10) a. 5.0 b. 5.3 c. 6.3 d. answer not listed
Please see the attached file. Determine the 2 chi-squared critical values for the following confidence levels and sample sizes. We are also interested in estimating the variation for the PDA selling prices through examination of the standard deviation, sigma (σ). We will again assume that selling prices are clo
A gambler plays roulette, and makes a $1.00 bet on a pair of numbers, 4000 times. The bet pays 17 to 1 and it covers two numbers. I need to find the chance that the casino will make less than $300 from these plays. 1. Find the amount of money the casino is expected to make 2. What is the standard error of the sum and the ch
Please see the attached for the math questions I need help with. 1. The following table gives the population of certain states according to the 2000 census. State Population Illinois 12,419,293 New Jersey 8,414,350 New York 18,976,457 Tennessee 5,689,283 Texas 20,851,820 Construct a bar graph from this informat
Always get overwhelmed by the amount of material when covered at a comprehensive level. Attached is the study material of what to be prepared to cover at the conclusion of this course. I have worked through them but get stumped at several points. Can you provide a systematic approach to these problems and provide a reference to
Please see the attached file for the fully formatted problems.
Answer the following, carrying your intermediate computations to at least three decimal places and rounding your responses to at least one decimal place. A) Given an estimate of this common population variance based on the variance of the sample means given. B) Give an estimate of this common population variance by pooling th
Expectation and variance of a random variable Let X be a random variable with the following probability distribution: Value x of x P(X=x) -30 0.35 -20 0.25 -10 0.05 0 0.30 10 0.05 Find the
1) A student's grade on an exam was transformed to a z-value which is negative. therefore, we know that he or she scored: Choices: higher 16% of class, higher than 45% of class, above the first quartile, below the mean, lower than 16% of the class. I think is is the lower than 16% of the class. 2) Which of one of the follow
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed, with a mean of 3 minutes and a standard deviation of 1 minute. The quality-assurance department found in a sample of 50 customers at the Warren Road MacBurger that the mean waiting time was 2.75 minutes. At the .05 signi
7-54. Jon Molnar will graduate from Carolina Forest High School this year. He took the American College Test (ACT) for college admission and received a score of 30. The high school principal informed him that only 2 percent of the students taking the exam receive a higher score. The mean score for all students taking the exam is
You are in charge of an experiment to evaluate a treatment which is advertised as being 90% effective at killing a particular insect. You plan an experiment in which the treatment is tested on 200 insects. a. If the advertising is accurate, what is the expected value and standard deviation of the number of insects that ought
A component is comprised of two halves. The thickness of each half is normally distributed with a mean of 2 millimeters and a standard deviation of 0.1 millimeter and the halves are independent. a. Determine the mean and standard deviation of total thickness of the two halves. Answer E(T)=4 , and sigma of T=0.1414 ? b. What
SEE ECCO INFO ATTACHED The quality manager at Ecco Company, a maker of back-up alarms for use on industrial vehciles such as forklifts, is interested in estimating the mean dollar volume for warranty claims for products made in Boise on the day shift. He has taken a pilot sample. See info attached. a. Assuming that the
6.1 Consider the following data to be a population of N=20 values ______________________________________________________________ 5 3 2 6 6 7 3 3 6 7 7 9 7 5 3 12 6 10 7 2 ___________________________
A union of restaurant and foodservice workers would like to estimate the mean hourly wage,µ, of foodservice workers in the U.S. The union will choose a random sample of wages and then estimate µ using the mean of the sample. What is the minimum sample size needed in order for the union to be 90% confident that its estimate is
1. A confidence interval for a population mean has a margin of error of 10.7. What is the length of the confidence interval? 2. A random sample of size 17 is taken from a population. A normal probability plot of the sample data is found to be very close to linear. The population standard deviation is unknown. The appropriate m
1. The time that the customers at the "self serve" check out stations at the Mejers store spend checking out follows a uniform distribution between 0 and 3 minutes. a. Determine the height and draw this uniform distribution. b. How long does the typical customer wait to check out? c. Determine the standard deviation of the
14. A file cabinet manufacturer estimates that 5% of its file cabinets will have drawers that close improperly. Assume a production run of 120 cabinets is completed. a. What is the mean and standard deviation of this distribution? b. What is the probability that 7 or more are defective? c. What is the probability that exactly
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, and 22. a. Compute the mean number and median number of apples in a bag. b. Verify that _(X _) _ 0. Describing Data: Numerical Measures 62. The Citizens Banking Company is stu
1. In words, explain what is measured by each of the a. SS b. Variance c. Standard Deviation 2. A population has u=100 & sigma=20. If you select a single score from this population, on the average, how close would it be to the population mean? Explain your answer 3. Can SS ever have a value less than zero? Explain your
A variable has a mean of 144 and a standard deviation of 25. Five observations of this variable have a mean of 156 and a sample standard deviation of 16. Determine the observed value of the a. standardized version of x (x with dash over, see attachment) b. studentized version of x (x with a dash over, see attachment).
Average Value of Business and Variance. See attached file for full problem description.
1. Using SPSS, check the following data for homogeneity of variance: Group 1 Group 2 Group 3 1 1 1 2 4 8 3 9 18 4 16 32 a) Using an alpha of .05, what can you conclude about homogeneity of variance from the output? Word process your response
The true length of boards cut at a mill with a listed length of 10 feet is normally distributed with a mean of 123 inches and a standard deviation of 1 inch. What proportion of the boards will be over 125 inches in length?
1. Suppose that a variable x has the following distribution function: x p(x) 3 0.23 5 0.41 9 0.36 What is the population mean? 2. Suppose that a variable x has the following distribution function: x p(x) 1 0.18 6 0.16 9 0.15 24 0.51 What is F(9)? 3. Suppose that a variable x has th
RESEARCHERS at a university conducted experiments with poplar trees. Listed below are weights (kg) of poplar trees given no treatment and poplar trees treated with fertilizer and irrigation. Does there appear to be a difference between the two standard deviations? No treatment: 0.15 0.02 0.16 0.37 0.22 fertilizer and irrig
Recently, the manager at Micron conducted a study of the time customers spent on hold waiting for a Micron representative to become available. The data showed that the distribution of time spent on hold is approximately normally distributed, with a mean of 18 minutes and a standard deviation of 4 minutes. Question: The servic
Over any given month, Dress-Rite loses 10% of its customers to Fashion, Inc., and 20% of its market to Luxury Living. But Fashion, Inc., loses 5% of its market to Dress-Rite and 10% of its market to Luxury Living each month; and Luxury Living loses 5% of its market to Fashion, Inc., and 5% of its market to Dress-Rite. At the p