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Assignment: Statistic Questions
QUESTION ONE
i. What is the difference between point estimation and interval estimation?
ii. A sample of 8 observations has been taken from a population in which the random variable is normally distributed. The sample mean is 25 and the sample standard deviation is 5. Determine a 95% confidence interval for the population mean.
iii. The mean life of a sample of 200 light tubes produced by a company is found to be 3160 hours with a standard deviation of 180 hours. Test the hypothesis that the mean lifetime of the tubes by the company is 3200 hours.
iv. A sample of 20 measurements of the diameter of a sphere gave a mean 4.38 inches and standard deviation of 0.06 inches find
a)95% confidence limit to the actual diameterb)99% confidence limit to the actual diameter.
1) Twenty-five factory workers were asked how many vacation days they take a year. The average of the sample was 22.85 days, and the standard deviation was 5.80 days. In the past HR uses an average of 25 vacation days per worker in order to ..
H0 states that is equal to 25. If n=30 , and x bar = 20 , and sigma = 3. What is the test statistic?
100 universities are randomly selected and the average income of those 100 universities was $49,450. Using the 5 step hypothesis testing process can you support the claim that the average income is $50,000? Use a .05 significance level. State the ..
What is the approximate sampling distribution of the sample mean? Use the 95 part of the 68-95-99.7 rule to describe the variability of this sample mean.
For these data, a 99% confidence interval for true mean weight loss by all patients attending the clinic would have the limits (?, ?).
How many standard deviations from the mean would a steer weighing 1000 pounds be?- Which would be more unusual, a steer weighing 1000 pounds or one weighing 1250 pounds?
Describe the data scales best suited for presentation in a pie chart. How effective are the pie charts that often accompany a newspaper article in explaining the statistics used in the article?
Compute the following: (Round the value for standard deviation and intermediate calculations to 2 decimal places and your final answer to 4 decimal places.)
the scores on an economics examination are normally distributed with a mean of 74 and a standard deviation of 16. if
a witness testifies that there are about 10 million men who could have been the perpetrator of a particular heinous
q1. listed below is the net sales in million for home depot inc. and its subsidiaries from 1993 to 2004.yearnet
if the average weight losses are to be compared among 3 different diets which of the following methods of analysis
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