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For an eight year period, Diane deposited $600 each quarter into an account paying 3.6% annual interest compounded quarterly. (round your answers to the nearest cent and show ALL work)
Describe the properties of central tendency and shape in numerical data. Explain how to find the range, variance, and standard deviation.
A company is producing two types of ski goggles. Thirty percent of the production is of type A, and the rest is of type B. Five percent of all type A goggles are returned within 10 days after the sa
You are a medical claims processor for Humana. Claims arrive at your desk at an average rate of three claims per day, but the actual number of claims fluctuates from day to day. You believe that the
Use the given values of n=93 and p=.25 to find the minimum usual value (mean-2 standard deviation) and the maximum usual value (mean + 2 standard deviation). Round your answer to the nearest hundret
A sample of 40 kids with chronic bronchitis are examined, and their mean peak expiratory flow is 279. Standard deviation is 7.1. Do children with chronic bronchitis have lower expiratory flow ? Alph
Estimate the population mean based on a sample of size 25 for which the average is 100 and the standard deviation is 25. Answer the following questions about constructing the 80 percent confidence i
Please give one example to explain the difference between an outlier and a data point with high leverage value. You can use numbers and graphs to help with the explanation.
When a newspaper article reports the results of a study and draws a conclusion without stating if the results are statistically significant what are the possible reasons for so doing? How seriously
What sample size would be required to reduce the standard deviation of the sampling distribution to one-half the value you found above. Justify your answer.
The drug price in a random sample of 16 retailers is on average $141. Standard deviation $4. If this is a random sample and the prices are normally distrubuted, construct a 95% confidence interval f
In a sample of 1000 fourth grade students, the average IQ score was 122. The prevailing view is that IQ is distributed normally with a mean of 100 and a standard deviation of 10. Draw a figure that
Discuss confidence intervals of the estimated intercepts and slopes. What is your RMSE? What does that mean? Of which parameter is it an estimate?
For the following problems, do the following: (a) Draw the scatter plot for the variables. (b) Compute the correlation coefficient. Use three decimal places.
Fit a logistic regression model to these data. Is the model you fitted in part (a) significant?. Interpret the regression coefficient Beta1 in terms of log odds ratio.
What is the calculated t value? Are the mean test scores of these two groups significantly different at the .05 level? What would the t value be if there were only 6 participants in each group? Would
The UMUC Daily News reported that the color distribution for plain M&M's was: 40% brown, 20% yellow, 20% orange, 10% green, and 10% tan. Each piece of candy in a random sample of 100 plain M&
Determine the test statistic. Show all work; writing the correct test statistic, without supporting work, will receive no credit. Determine the critical value. Show all work; writing the correct cr
Suppose X and Y are independent. Let X have the mean 3 and Y have the mean 2. Find the covariance of X+Y and X-Y
What is the number of trials (n), probability of successes (p) and probability of failures (q), respectively? Find the probability that she returns at least 2 of the 10 serves from her opponent.
Determine the expected value of x. Determine the standard deviation of x.
What is the probability that the outcome of the second roll is an odd number, given that the first roll is greater than 4? Are A and B independent? Why or why not?
Find the z* value based on standard normal distribution for each of the following 88% confidence interval for a correlation a)1.175 b) 2.326 c)1.555 d)2.575
You are aware that for IQ mean = 100 and standard deviation = 10. What is the probaility of randomly selecting someone from the population with an IQ between 112 and 120?
1. What information does calculating standard deviation provide? How is the z-score related to standard deviation?