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Construct a 95 percent confidence interval for the population proportion of positive drug tests. Why may you assume that this is a normal distribution?
Identify the null hypothesis, alternative hypothesis, test statistic, P-value, conclusion about null hypothesis, and final conclusion that addresses the original claim.
A sample of 36 batteries showed an average life of 88.5 hours. Assume from past information that it is known that the standard deviation of the population is 9 hours.
What decision does the expected value approach recommend? If your decision in patrt c was to place the bet, repeat the analysis assuming a minimum bet of $10,000.
of all 3 to 5 year old childern 56% are enrolled in school. if a sample of 500 such children is randomly selected, find the probability that at least 250 will be in school.
At 0.05 significance level, is there a difference in the mean number of defects per shift? Assume that the populations are approximately normally distributed and the variances are equal.
What is the probability that a randomly selected from such a hen weighs more than 11.5 grams
Nationwide, the average waiting time until a electric utility customer service representative answers a call is 250 seconds per call. The Gigantic Kilowatt Energy Company took a sample of 45 calls a
If 50 different homes are randomly selected, find the probability that their mean energy consumption level for September is greater than 1075 KWh.
1025 randomly selected adults surveyed, 29% said used internet for shopping at least a few times a year. (A) find point estimate-I come up with .29 (B) find 99% confidence interval estimate (C) if w
An urn contains 16 balls of which 5 are red. if we select 1 ball, what is the probability that a red ball will be chosen? If we randomly select 5 balls with replacement.
Use statistics to describe the ages, household incomes, and education of the five groups of car buyers. 2. Use a graphical technique to compare the ages, household incomes.
A manufacturer of headache medicine claims it is 70 percent effective within a few minutes. That is, out of every 100 users 70 get relief within a few minutes. A group of 12 patients are given the m
Only one of which leads to the hiker's destination. The hiker has no map and makes random choices of trail and subtrail. What is the probability of reaching the destination?
According to the Bureau of statistics, 60% of households headed by single women own autos. Find the probability that in a random sample of 9 households headed by single women.
On a very hot summer day 5% of the production employees at midland states steel are absent from work. The production employees are to be selected at random fro a special in depth study on absenteei
What sample size would be necessary to estimate the true weight with an error of ± 0.03 grams with 95 percent confidence?
x is normally distributed random variable with a mean of 8.00. if the probability that x is less than 9.54 is .67 then what is the standard deviation of x.
A medical researcher is interested in determining if there is a relationship between adults over 50 who walk regularly and low, moderate, and high blood pressure. A random sample of 236 adults over
100 scale with a standard deviation of 10. Calculate and interpret the 90 precent confidence interval for the population mean level of satisfaction.
The time to complete a construction project is normally distributed with a mean of 60 weeks and a standard deviation of 4 weeks. What is the probability the project will take longer than 65 weeks?
On the average 3 birds hit the Washington Monument and are killed each week. Assuming a Poisson distribution. What is the probability that no birds hit the Monument in a week.
What is the probability that the sample average would be between 98 and 105 pounds?
while sixty cigarettes of brand B had an average nicotine content of 2.7 milligrams with standard devation s=1.0 milligram. construct a 95% confidence interval for the difference between the mean ni
A company determined that on an annual basis. What proportion of cars can be expected to travel between 34,000 and 50,000 miles in a year?