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A Psychologist has developed a new method designed to help people taking an exam. The method requires the person to come to the office of the Psychologist 5 times over a 5 week period and involves h
Test the claim that the babies born to mothers who received moer prenatal care are larger than the babies born to mothers who received less prenatal care. Use alpha= 0.05. State the null and alterna
How large a sample should be surveyed to estimate the true proportion of college students who do laundry once a week within 3% with 95% confidence?
It is thought that the application of a plasma coating that conatins submicron particles of tungsten carbide will reduce wear to rotary valves used in the pulp and paper industry. Tests are conducte
For 40 hardware callers, the average was 16.8 minutes with a standard deviation of 2.1 minutes. The manager decided to assume that the population standard deviations were unequal. At alpha =0.5 can
The Turners have purchased a house for $160,000. They made an initial down payment of $30,000 and secured a mortgage with interest charged at the rate of 7%/year compounded monthly on the unpaid bal
A corporation creates a sinking fund in order to have $980,000 to replace some machinery in 9 years. How much should be placed in this account at the end of each week if the annual interest rate is
How much interest would they earn over the life of the account? Determine the value of the fund after 2, 4, and 6 years.
A research study showed that 50% of workers change jobs within 2 years of employment. George took a random sample of 100 new hires at Starbucks during the last 2 years and found that 47 had changed
Arbitron Media Research Inc. conducted a study of the iPod listening habits of men and women. One facet of the study involved the mean listening time. It was discovered that the mean listening time
What is the critical F value for a sample of 9 observations in the numerator and 6 in the denominator? Use a two-tailed test and the 0.1 significance level. (Round your answer to 2 decimal places.)
What is your point estimate of the percentage of satisfied customers? What is the p-value provided by the sample data? (This is the part I don't understand, there is no standard deviation given, so I
Develop a 98% confidence interval for the proportion opposing health care changes. (Round your answers to 4 decimal places.). Confidence interval for the proportion is and.
Explain why MS-within is not an appropriate error term (demoninator) for the repeated measures F-ratio
In a published study the author has presented a scatter plot of data with a line drawn through the data points. this line is describded as the best fitting line based on least squared error. What is
Why is the t-test more widely useful for hypothesis testing compared to a z-score
You need to estimate the mean number of travel days per year for outside salespeople. The mean of a small pilot study was 120 days, with a standard deviation of 16 days. If you must estimate the p
What value is expected on average for the F-ratio in ANOVA when the null hypothesis is true. EXPLAIN why this value is expected.
According to the Insurance Institute of America, a family of four spends between $400 and $3,800.00 per year on all types of insurance. Suppose the money spent is uniformly distributed. What is the
You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 99% confidence level and state that the estimated proportion must be within 3% of the po
Use table to find each critical values: Use table to find each critical values:
Suppose that the life span of a certain type of fan has an exponential distribution with a mean life span of 25000 hours. Find the probability thaat a randomly selected fan will last
If we reject the null hypothesis what can we conclude subject to the ? risk?
A pharmaceutical company receives large shipments of ibuprofen tablets and uses this acceptance sampling plan: randomly select and test 23 tablets, then accept the whole batch if there is at most on
The television show Pretty Betty has been successful for many years. That show recently had a share of 16, meaning that among the TV sets in use, 16% were tuned to Pretty Betty. Assume that an adver