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what should I charge you to play? Using your ticket price, how many games would have to be played in order for me to have an expected profit of $100?
If a group of 400 school children are selected at random, what is the probability that at most 70 children will miss school because of asthma?
What do confidence intervals represent? What is the most controllable method of increasing the precision of or narrowing the confidence interval?
The mean numbers of trials to learn maze for the group with the colrful wallpaper is 11. What is the standard deviation of the distribution of means?
Why do so many of life's events share the same characteristics as the central limit theorem? Why are estimations and confidence intervals important?
A survey of autos parked in student and staff lots at a large university classified the brands by country of origin, as seen in the table:
Why is the population shape a concern when estimating a mean? What effect does sample size, n, have on the estimate of the mean?
The factor "educational background" received a mean ranking of 7.2. Is the sample mean of 7.2 exactly the same as the population mean?
Assume that the salaries of elementry school teachers in the US are normally distributed with a mean of $32,000 and a standad deviation of $3000. If 100 teachers are randomly selected, find the prob
In random samples of 25 from each of two normal populations, we found the following statistics: Discuss the effects of increasing the sample size.
In a local university,40% of the students live in the dormitories. A random sample of 80 students is selected for a particular study. What is the probability that the sample proportion (the proporti
Discuss how a t Test can be employed in hypothesis testing by the use of directional vs. nondirectional hypotheses. Discuss types of research where using the t statistic may be an appropriate alter
A card is drawn at random from a standard deck of playing cards. You win $1 if you draw a seven and $24 if you draw an ace. Otherwise you loose $2. What is the expected value of the game?
A random sample of n = 4 scores is obtained from a normal population with m = 40 and s = 6. What is the probability of obtaining a mean greater than M = 46 for this sample?
The odds against a particular candidate winning an election are estimated to be 5 to 8. If those odds are accurate, what is the probability that the candidate will win the election?
The amount of time a bank teller spends with each customer has a population mean μ = 3.10 minutes. What is the probability that the average time spent per customer will be at least 3 minutes?
A random sample of n = 4 scores is obtained from a normal population with m = 20 and s = 4. What is the probability of obtaining a mean greater than M = 22 for this sample?
A flying company offers trips in Europe. The company flies three kinds of airplanes: the Boeing 757, the Boeing 767, and the Boeing 777. Each plane is outfitted with tourist, economy, and first-clas
What are the mean and standard deviation of the total number of lightning strikes observed? What are the mean and standard deviation of the mean number of strikes per square kilometer?
A national survey is conducted to assess the association between hypertension and stroke in persons over 55 years of age. Development of stroke was monitored over a 5 year follow-up period. The data
Assuming the manufacturer's claim is true, what is the probability the consumer group's sample has a mean life of 52 or fewer months?
In a simple linear regression you are told that the estimate of the slope coefficient was 0.9 and that the "t-statistic" for testing whether the slope parameter was unity or not was -3.6. What is th
A sample of 25 provided a sample mean x=14 and a sample standard deviation s = 4.32 a. Compute the test statistic.
Approximately 30% of obese patients develop diabetes. If a physician sees 10 patients who are obese, a) What is the probability that half of them will develop diabetes? b) What is the probability th
A random sample of 20 items from the first population showed a mean of 100 and a standard deviation of 15. Compute the value of the test statistic.