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A research organization wanted to estimate the average number of hours a college student sleeps per night during the school year. After randomly sampling 159 college students, the research organizat
According to the central limit theorem what should the theoretical mean and standard deviation be for each of these sample sizes?
What are the appropriate null and alternative hypotheses to test whether the mean for population 2 is larger that that for population 1.
Assuming that the time interval includes the left limit and all the times up to but not including the right limit, estimate the probability that an inventor has a good idea during the time interval
Suppose you are conducting a study with a total of 50 participants from five different regions of the country, and you want to determine if the average blood pressure is different among these groups
Suppose the level of confidence decreases. What would happen to the width of the confidence interval? Stay the same, increase or decrease?
What is the probability that the student will successfully earn exactly the required minimum score of 70% on the exam based solely upon randomly guessing the answer for each question?
A researcher hypothesizes that the variation in the amount of money spent on business dinners is greater than the variation of the amount of money spent on lunches. The variance of nine business din
What is the standard deviation for the number of girls for this distribution? Round your answer to one place value more than the given data and attach units.
Find the 80th percentile for the average of these 49 marathons. (Round your answer to two decimal places.) Find the median of the average running times.
A manufacturer claims the average life of a product is 500 hours. The lifetime of the product is assumed to follow an exponential distribution. What is the probability that the product will last les
What does a negative correlation statistic value mean?
In a random sample of 5 parts on an assembly line, the probability that one of the parts is defect is 15% and follows a binomial distribution. What is the probability of no parts being defective?
A-the middle 99.7% of males scored between what two values. B-what about the females, C-to get admiited to an ivy league univeristy you should have a minium math score of 710 what is the probability
The Beer institue conducted a study with looking at beer purcheses per capita across states. Some states buy more beer (43 Gallons PP in New Hampshire) Data is normally distributed with an average o
Agents at an insurance company office in a small town process an average of fifteen auto insurance claims per week. Assuming that the number of claims per week is a Poisson random variable.
The following is the heart rate for 10 randomly selected patients on the unit. Find the mean, variance, and standard deviation of the data using the descriptive statistics option in the data analysi
Heights of women have a bell-shaped distribution with a mean of 156 cm and a standard deviation of 8cm using the Chebyshev's theorem what do we know about the percentage of women with heights that a
Compute the following binomial probabilities using Table A.1, a table of Cumulative Binomial Probabilities, in the back of the text. Give your answers to 3 decimal places, without the leading zero,
What is the mean amount of daily pocket money his son receives? Enter the result in cents to 2 places after the decimal, without the units, i.e. xx.xx
Use exponential smoothing with alpha = .2 and the smoothed forecast for July is 32. Determine the smoothed forecast for August.
Partition 100 numbers from 0 to 99 according to the probability of each demand value, starting with 0. A number from the 100 numbers is going to be selected. What is the corresponding demand value i
Consider an experiment where we study the ability of snails tohold firmly onto a smooth substrate. We would like to know ifthe species of snail is independent of the ability.
If the data yielded a sample mean of 19.3 minutes with a standard deviation of 5.2 minutes, estimate the true mean time and calc ulate the margin of error.
Construct now the 95% confidence interval for the difference p1-p2. Could you conclude that p1 and p2 are different ? Explain your answer.