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The mean score of the overall population of high school seniros is known to be 455 with a standard deviation of 100. the mean score for thsoe who took the course was 500. Compute the effect size of
Find the value of the standardized z-test statistic. Test Ho: p= 0.75 verses Ha: p>0.75 when the sample has n=20, ^p=0.78, and SE 0.015
A population of N = 10 scores has a mean = 50 and a standard deviation = 5. What is the population variance?
Find the p-value based on a standard normal distribution for the standardized test statistic and provided alternative hypothesis. z= -1.86 for Ha: p <0.5
Find the z* values based on a standard normal distribution for an 86% confidence interval for a proportion, for a 78% confidence interval for a mean.
Dave drives to work each morning at about the same time. His commute time is normally distributed with a mean of 35 minutes and a standard deviation of 5 minutes. The percentage of time that his com
A trucking firm delivers appliances for a large retail operation. The packages (or crates) have a mean weight of 291 lb. and a variance of 2704. (Give your answers correct to four decimal places.)
An advocacy group is investigating whether gender has an effect on job category in large investment firms. Given the results shown in the table below, which of the following statements is true ab
Determine the standard deviation, if the mean is 1.5 and the coefficient of variation is 2.5%. (Enter your answer to 4 decimal places.)
A quiz cosists of 10 multiple-choice questions, each with 6 possible answers. For someone who makes random guesses for all of the answers, find the probability of passing if the minimum passing grad
A recent study of robberies for a certain geographic area showed an average of 1 robbery per 20,000 people. In a city of 80,000 people, find the probability of the following and please show your wor
A and B could have a relationship that is negative meaning they are headed in opposite directions or positive meaning there are headed in the same direction but A and B could have a relationship bec
Generate 10,000 received waveforms and plot their histogram. The receiver assume the transmitted bit is 1 if r(n)>0, and transmitted bit is 0 if r(n)<0. Compute the bit error probability.
The numbers 8, 9, 10, and 12 are written on separate pieces of paper and put into a hat. Two pieces of paper are drawn at the same time and the product of the numbers is recorded. Find the sample sp
What is the maximun mean score that you could have after the next quiz? What is the minimum mean score that you could have afterthe next quiz?
The number of viewers of American Idol has a mean of 29 million with a standard deviation of 10 million. Assume this distribution follows a normal distribution. What is the probability that next wee
What value would be the cutoff for the top 10%, if you have a mean of 10 and a standard deviation of 2?
Assume that the mean hourly cost to operate a commercial airplane follows the normal distribution with a mean of $2,225 per hour and a standard deviation of $195. What is the operating cost for the
An April 15, 2002 report in Time Magazine stated that the average age for women to marry in the United States is now 24.4 years of age. If the standard deviation is assumed to be 4.8 years, find the
A survey is to be made of the prevalence of the common disease in a large population. For any disease that affects atleast 1% of the individuals of the population, it is desired to estimate the tota
If the standard deviation for the number of televisions in a U.S. household is 1.3 and a random sample of 90 American households is selected, the mean of this sample belongs to a sampling distributi
Write out the appropriate null and alternative hypotheses for this test. If you use variables, be sure to define what they represent.
Write out the expected counts under the null hypothesis and calculate the chi-squared test statistic. Calculate a p-value and make a decision.
The media often attempts to predict the outcome of national elections. Why are they often wrong? Based on the concepts presented in this module's readings, how could the system be improved?