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Suppose that telephone calls arriving at a particular switchboard follow a Poisson process with an average of 5 calls coming per minute. What is the probability that up to a minute will elapse unti
In how many ways can at least one of the 3 selected vials have a hairline crack if the order of selection does not matter?
Police estimate that in one city 48% of drivers wear their seat belts. They set up a safety roadblock, stopping cars to check for seat belt use. If they stop 40 cars during the first hour, what is
A random sample of 85 group leaders, supervisors, and similar personnel revealed that on the average a person spent 6.5 years on the job before being promoted. The standard deviation of the sample w
If the instructor of the class randomly chooses 8 students from the class for an oral exam, what is the probability that 3 female students and 5 male students will be selected?
In a study, 35% of adults questioned reported that their health was excellent. A researcher wishes to study the health of people living close to a nuclear power plant. Among 12 adults randomly selec
The quality-control department took a random sample of 50 cans and found that the arithmetic mean weight was 16.05 ounces? Determine the p-value.
a retailer store sales only two styles of stereo consoles, and experiences shows that these are in equal demand. Four customers in succession come into the store to order stereos. The retailer is i
Suppose that p = P(female birth) = 0.5. A couple wishes to have exactly one female child in their family. What is the probability that the family has three children?
A random sample of 30 households was selected from a particular neighborhood. The number of cars for each household is shown below. Estimate the mean number of cars per household for the population
The distribution of scores on a standardized aptitude test is approximately normal with a mean of 480 and a standard deviation of 105 . What is the minimum score needed to be in the top 25% on this
Assume the probability that a person has the desease is 0.1 for all people, independently of each other. Compute the total expected number of tests necessary.
The amounts (in ounces) of juice in eight randomly selected juice bottles are: Construct a 98% confidence interval for the mean amount of juice in all such bottles.
Develop a 95% confidence interval estimate of the men amount spent per day by a family of four visiting Niagara Falls.
what is the probability that the average number of gallons sold will be 170 or less? (please round your answer to 4 decimal places)
The principal randomly selected six students to take an aptitude test. Their scores were: Determine a 90% confidence interval for the mean score for all students.
They find that the average cost for 1 week is $247 with a standard deviation of $60. Therefore, the p-value is 0.017. When testing the hypothesis (at the 5% level of significance) that the average e
Compute the critical value to determine whether or not the tire company is using legitimate advertising. Assume the population is normally distributed.
In testing the hypotheses H0:π =0.40, : 0.40 a H π > at the 5% significance level, if the sample proportion is .45, and the standard error of the sample proportion is .035, the appropriate
In a sample of 80 people who have had strokes, the average cholesterol level was 250 with a standard deviation of 70. In order to test the hypothesis (at the 5% level of significance) that the avera
who have had strokes have had high blood pressure (using the 10% level of signficance) what is the critical value? (please round your answer to 2 decimal places)
To determine whether high blood pressure affected whether a person had a stroke, a sample of 123 people who had had strokes are examined. In the sample, 38% had high blood pressure. If we were to te
Suppose that the firm wishes to choose a small sample of driving distances from the past year and carry out a hypothesis test for its suspicion. State the null hypothesis and the alternative hypothe
A research organization is making a study of the selling price of home computers. There are 45 computers in the study. How many classes would you recommend? Why?
Find the LOWER bound of the 99% confidence level of the average amount spent on F&B. (please express your answer using 2 decimal places)