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1. In a random sample of 24 people, the mean number of books they had read in the past year was 11.22 books and the standard deviation was 16.60 books. Assume the variable is normally distributed and use a t-distribution to construct a 95% confidence interval for the population mean . What is the margin of error of ?
(Round to nearest hundredth.)
2. A researcher wishes to estimate, with 95% confidence, the proportion of adults who have high-speed Internet access. Her estimate must be accurate within 1% of the true proportion,
a) Find the minimum sample size needed, using a prior study that found that 38% of the respondents said they have high-speed Internet access. (Round to nearest whole number.)
b) No preliminary estimate is available. Find the minimum sample size needed.
3. About 72% of all female heart transplant patients will survive for at least 3 years. 60 female heart transplant patients are randomly selected. What is the probability thst sample proportion surviving for at least 3 years will be less than 67%? Assume that the sampling distribution of sample proportions is a normal distribution.
q1 both undergraduates and postgraduates can use the university cafeteria. each diner can choose between buying a meal
Please see the attached file for the fully formatted problems. Convert the following equations into logarithmic form:
Organise the data in appropriate class intervals and draw a histogram of the frequency distribution and find the Mean, Median, Range, Standard Deviation and Coefficient of Variation of the yield for the top 40 Australian companies.
if the population mean is assumed to be 20 and the sample standard deviation is 5 a score of 15 would have a z-value of
An investment broker reports that the yearly returns on common stocks are approximately normally distributed with a mean return of 12.4 percent and a standard deviation of 20.6 percent.
Given that we have collected pairs of observations on two variables X and Y , we would consider fitting a straight line with X as an explanatory variable if:
Random from a large production had 8 defective discs. Determine a 98% confidence interval for the population proportion of the defective disc drives.
An investment counselor would like to meet with 12 of his clients on Monday, but he has time for only 8 appointments. How many different combinations of the clients could be considered for inclusion into his limited schedule for that day?
How would you describe the function of a generalized linear regression model?
Average length of trout caught in Swanson lake is u=19.For a random sample of 51 fish caught the mean length was xbar=18.5 inches with estimated standard deviation s=3.2 inches.
Primary healthcare workers believe that anaphylactic shock reaction to immunization injections occurs with children in one case in two thousand.
A researcher selected a sample of 50 residents from each of 3 different cities to determine if they were willing to participate in a medical experiment. which of the following assumptions is NOT made for the F test for comparing 3 or more means?
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