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45 percent households say they would feel secure if they had $50,000 in savings. you randemly select 8 households and ask them if they would feel secure if they had $50000in savings. Find the probablity that the number that say would feel secure is (a)exactly five (b)more than five (c)at most five
A researcher wants to estimate the average time (in minutes) spent in a car daily. This will be done by randomly surveying 300 individuals and calculating the sample mean.
The expected peak expiratory flow rate in adults is 300 with a standard deviation of 50. how many subjects should be enrolled to ensure 80% power to detect a difference of 15 liters per minute with a two-sided test and significance level of 0.05?
I believe this can be done by plotting out every 3 years average number of people working past 65 since 1997 until now and then making a predictability study as to number of people who will be working over the age of 65 in 2012.
A mean life of 1800 hours and a standard deviation of 200 hours. Assume the life of these light bulbs follows a normal distribution. Find the probability that a single light bulb will have a life greater than 2000 hours.
A sample of 49 observations is taken from a normal population. The sample mean is 55 and the sample standard deviation is 10. Determine the 99% confidence interval for the population mean.
You suspect the distribution of the population is not Normal and may be moderately skewed. Which of the following statements is correct?
Katie is studying aggression among adolescent girls. She believes that there is a relationship between the level of interaction a girl has with her mother and her level of aggression.
Quality control engineer has been checking output by almost continuous sampling as abnormal condition began. Determine the probability that in sample of 10 pieces.
In hypothesis testing when is a two-tail test used in lieu of a one-tail test?
What is the best prediction for the number of products sold based on advertising costs of $7000?
Compare and contrast internal and external validity. Describe and give examples of research questions for which external validity is a primary concern.
Heights were measured for a random sample of 20 plants grown while being treated with a particular nutrient. The sample mean and sample standard deviation of those height measurements were 39 centimeters and 12 centimeters, respectively.
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