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In the following situation, suppose random variable is normally distributed and use normal distribution or a t-distribution to create 90% confidence interval for population mean. If convenient, use technology to create the confidence interval.
(a) In the random sample of 10 adults from nearby county, mean waste generated per person per day was 4.35 pounds and standard deviation was 1.88 pounds.
(b) Repeat part (a), suppose same statistics came from a sample size of 500. Distinguish the results.
(a) For sample of 10 adults, the 90% confidence interval is ( ), ( ).
(b) Now suppose the sample came from sample size of 500. Distinguish the results.
Use the information given to calculate the standard error of the mean. Mean systolic blood pressure for a sample of n=324 men is =123.5, and the standard deviation is s=9.
Use frequency distribution to create a probability distribution, determine the (b) mean,(c) variance and (d) standard deviation of probability distribution and (e) interpret results in context of real life situation.
a. Formulate the null and alternative hypotheses. b. Which statistical test would you use? Why?
A recent survey by alumni of a major university indicated that average salary of 8000 of its 250,000 graduates was $120,000. Does this signify population parameter or sample statistic?
What is the mean and standard deviation of the number preferring the incumbent and what is the probability that more than 68% will favor the incumbent?
Formulate a linear programming model that can be used to determine the number of units each model that should be produced in order to maximize the total contribution to profit
Given a binomial distribution with n=29 and p=0.83, would the normal distribution provide a reasonable approximation? Why or why not.
A recent study of minimum wage earners found that 51.3% of them are 16 to 24. suppose a sample of 600 minimum wage earners is selected. is it appropriate to use the normal approximation to the binomial distribution.
An automobile manufacturer claims the variance in the fuel consumption for its vehicles is less than the variance of similar type vehicles from another competitor.
A scatterplot shows a set of data points that are clustered close to a line that slopes down to the right. Which of the following values would be closest to the correlation for these data?
Find out how to minimize cost of meeting demands in Houston and Tampa.
Determine the proportion of variation in grade that can be explained by the linear correlation between the grade and the number of credit hours earned at the same time of taking the course.
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