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If a player enters one lottery each week, what is the expected number of weeks until a player matches all 6 numbers in the state's sample?
How many of the installations at the Maumee branch would you expect to take more than 30 minutes?
5 machines in another, and 2 machines in a third. The quality manager wants to vary the inspector's route. How many different ways are possible?
A newspaper article about the results of a poll states: In theory, the results of such a poll, in 99 cases out of 100 should differ by no more than 5 percentage points in either direction from what
What is the probability of 0 nonconforming units on the first sample and 2 nonconforming units on the second? The first gasket selected is returned to the lot before the second one is selected.
On a grammer test, half the students scored 90%. Of the remaining students, most scored in the 705-79% range. However, a few students scored below 60%. What would be the distribution of scores in th
The number of cars sold annually by used car salespeople is normally distributed with a standard deviation of 15. A random sample of 15 salespeople was taken and the number of cars each sold is list
Computers contains an average of 17 damaged computers with a standard deviation of three. What percentage of shipments will have between 11 and 23 damaged computers?
A medical statistician wants to estimate the average weight loss of people who are on a new diet plan. In a preliminary study, he guesses that the standard deviation of the population weight losses
A college wants to know the lower limit of a two-sided 95% confidence interval for SAT scores on the Math section (range equals 200 to 800). They sampled 400 students and found that the sample mean
The sample mean was calculated as = 5,064 hours. If we assume that the lifetime of this type of bulb has a standard deviation of 400 hours, can we conclude at the 5% significant level that the claim
If an executive submits an expense of $720 for a one-day stay in Moscow, should this expense be considered unusually high? Why or why not?
Mall security estimates that the average daily per-store theft is exactly $200, but wants to determine the accuracy of this statistic. The company researcher takes a sample of 81 clerks and finds t
.A random sample of 50 was drawn from a population. The sample mean and standard deviation are = 530 and s = 125. Estimate μ with 95% confidence.
.A statistic practitioner randomly sampled 1,500 observations and found = 14 and s = 22. Test to determine whether there is enough evidence at the 5% significance level to infer that the population
If a class of 30 students is chosen at random from the university population, find the mean and variance of the number of male students.
To evaluate the profitability of the process, a sample of six diamonds was generated using this new process, with recorded weights .46, .61, .52, .48, .57, and .54 karat. Do the six measurements pre
the combined sat scores of students are normally distributed with a mean of 950 and a standard deviation of 200. nancy bright's sat score was 1390. what percentage of students have scores more than
A social scientist claims that the average adult watches less than 30 hours of television per week. He collects data on 50 individuals' television viewing habits and finds that the mean number of ho
Use a statistical software system to determine whether there is a difference in the mean weights of candies of different colors. Use the .05 significance level.
90% confidence interval with a margin of error of 2 minutes. a normal distribution with a standard deviation of 30 minutes. the number of observation required is ?
46% of men consider themselves professional baseball fans. you randomly select 10 men and ask if he considers himself a professional baseball fan. Find the probability that the number who consider t
Suppose that the lifetime of a light bulb is exponentially distributed, with a mean of 2,000 hours. What is the probability that the light bulb will burn out in fewer than 1,000 hours?
The time to failure of a nickel-cadmium battery is Weibull-distributed with parameters v=0 α = 1/2 years and β = 1/4. What fraction of batteries are expected to last longer that the mean li
If Xbar is the sample mean diameter for a random sample of n = 16 rings, where is the sampling distribution of Xbar centered, and what is the standard deviation of the Xbar distribution?