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Fifty people are selected randomly from a certain population and it is found that 14 people in the sample are over 6 feet tall. What is the point estimate of the true proportion of people in the po
The use of electrical stimulation (ES) to increase muscular strength is discussed in the Journal of Orthopedic and Sports Physical Therapy. Predict the torque for a current equal to 50 mA.
A study of nickels showed that the standard deviation of the weight of nickels is 300 milligrams. A coin counter manufacturer wishes to find the 90% confidence interval for the average weight of a n
The weights of full boxes of a certain kind of cereal are normally distributed with a standard deviation of 0.27 oz. What effect did the increase in the level of confidence have on the width of the co
The playing time X of classical CDs has the normal distribution with a mean of 54 and a standard deviation of 5; the N(54, 5) distribution. What is the relative frequency of classical CDs with a pla
The exam is constructed such that the scores are normally distributed with an average of 1500 and a standard deviation of 150 what is the minimum exam score necessary for applicants to be further co
Is there good evidence that the proportion of students who succeed is different for urban/suburban versus rural/small-town backgrounds?
The output from a sewage treatment plant is constantly monitored to assess treatment efficacy. Suppose that the mean coliform content is 20 bacteria/ml with a standard deviation of 4 bacteria/ml. An
The test question was if this difference between the test statistics and the stated life of the battery was significant? The .05 significant level was selected for the test. Which is the correct sta
The Greater Pittsburgh Area Chamber of Commerce wants to estimate the mean time workers who are employed in the downtown area spend getting to work. A sample of 15 workers revealed the following num
Her thesis advisor has suggested that the distribution of hatching times will have the same shape as that of the Purple Throated Tree-tappers, which is "mound-shaped." If the researcher is willing t
Z-scores are standard scores whereas t-scores are standardized scores. Compare and contrast the similarities and differences between the two scores and explain when and why you would use each.
Dr. Zak also gave his students the Beck Depression Inventory (BDI). The correlation between his test and the BDI was r =.14. Evaluate this correlation. What does this correlation tell us about the r
In a survey of 2480 golfers, 15% said they were left-handed. Construct to the 95% confidence interval for the population proportion p.
The average time between infection with the AIDS virus and developing AIDS has been estimated to be 8 years with a standard deviation of about 2 years. Approximately what percentage of people develo
Using the stem and leaf technique, construct a less-than cumulative frequency distribution. -Draw to scale a histogram, frequency polygon and less-than cumulative ogive using the information from 1.
Your office has just received 110 insurance claims to be processed in the next few days. What is the probability that fewer than 45 of the claims have been padded?
The dean of a business school wishes to form an executive committee of 5 from among the 40 tenured faculty members at the school. The selection is to be random, and at the school there are 8 tenure
35% of adult Americans are regular voters. A random sample of 250 adults in a medium-sized college town were surveyed, and it was found that 110 were regular voters. Estimate the true proportion of
Can the college conclude that the students in the new program are significantly different from the rest of the freshman class? Use a two-tailed test with a .O5.
Walmart recieves 2 shipments. Shipment 1 contains 30 women's slacks & 15 men's slacks. Shipment 2 contains 35 ladies slacks & 10 men's slacks. One shipment is chosen at random and a pair of
Out of a population of 250,000,000, what is the probabiltiy that 12 white people would be randomly selected out of a populationthat is 90% white?.
A disease is genetically linked to males 50% of the time and females 0% of the time. Further support that 51.3% of births are male. What is the probability that a randomly chosen child will be affe
A computer manufacturer is interested in offering a new model with a state-of-the-art microprocessor that the production department claims has a faster calculation speed than any machine the company
Find the cumulative distribution function and the probability that any given defects occur between 1.5 miles and 2.5 miles along the stretch of road?