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1. As an aid to the establishment of personnel requirements, the director of a hospital wishes to estimate the mean number of people who are admitted to the emergency room during a 24-hour period. The director randomly selects 64 different 24-hour periods and determines the number of admissions for each. For this sample = 19.8 and s2 = 25. Using the sample standard deviation as an estimate for the population standard deviation, what size sample should the director choose if she wishes to estimate the mean number of admissions per 24-hour period to within 1 admission with 99 percent reliability,?
2. A university dean is interested in determining the proportion of students who receive some sort of financial aid. Rather than examine the records for all students, the dean randomly selects 200 students and finds that 118 of them are receiving financial aid. Utilize a 90 percent confidence interval to estimate the true proportion of students who receive financial aid.
3. An economist is interested in studying the incomes of consumers in a particular region. The population standard deviation is called to be $1,000. A random sample of 50 individuals resulted in an average income of $15,000. What total sample size would the economist need to use for a 95 percent confidence interval if width of the interval should not be more than $100?
a) n = 1537
b) n = 385
c) n = 40
d) n = 20
The singer has the following variety of songs, in no particular order: 7 relationship songs, 6 songs about people, 4 reflective songs, and 4 songs about places.
Find a 98% confidence interval for the mean number of days required for successful completion of physical therapy for patients in the average group. Discuss the results.
where p is the binomial probability of returning a completed survey, and log is the natural logarithm. The multiple logistic regression output from fitting this model is given below.
Given 7 male individuals in a Physical Education course, the number of sit ups each individual can do in a one minute period was recorded:
Which of the following is true about the expected value of perfect information. It is the amount you would pay for any sample study.
Evaluate the result in part c with the decision using the expected value approach.
Since 38% is less than 40%, does this mean that immediate production cutbacks are needed or can this difference of 2 percentage points be attributed to sampling?
Determine if there is a linear correlation between annual income and the amount of insurance? What is the linear regression line for this data?
Create a 90% confidence interval for mean score on this placement exam for all students.
Findout the consumption level separating the bottom 45% to the top 55%. The September energy consumption levels for single family homes are found to the normally distributed with a mean
What IQ score should one have in order to be eligible for Mensa?
Compute the probability of exactly 0,1,2,3,4, and 5 arrivals per day.
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