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The mass of a small loaf of bread is normally distributed with mean 500 grams and standard deviation of 20 grams. Find the probability that a randomly selected loaf has a mass at least 510g.
Statistics released by the National Highway Traffic Safety Administration and the National Safety Council show that on an average weekend night, 1 out of every 10 drivers on the road is drunk. If 40
Suppose the monthly income of assistant managers of our local banks are normally distributed with mean of 40,000 and a standard deviation of 5,000. What is the z score for an income of 42,000?
One-sixth of the male freshmen entering a large state school are out-of-state students. If the students are assigned at random to the dormitories, 180 to a building, what is the probability that in
Consider the normal distribution of IQs with mean of 100 and a standard deviation of 16. What percentage of IQs are less than 120?
What is the probability that if an assistant manager is chosen at random then his income is between 35,000 and 40,000?
The annual income was $58,700 with a standard deviation of $1,500. Find a 95% confidence interval for the true mean annual income of the nursing school alumni.
Let Y1, Y2, ..., Yn be independent random variables such that each Yi has an exponential distribution with mean Bi. Let the random variable V be defined as V = min (Y1, Y2, ..., Yn). Find the proba
Suppose you select a sample of 5 seats, subject each of them to the stress test and compute the mean score for the sample. What is the probability that the mean score will be less than 6.2?
Assume that a practitioner decides to use a control chart wtih a 2.5-sigma limits. If normality can be assumed (as well as known parameter values), what is the numerical value of the in-control
A. What is the point estimate for the proportion of people preferring model B? B. Write suitable null and alternative hypotheses in words and symbols for this problem.
P-value from tstat. A one-sample t statistic for H0: µ = 0 based on n = 16 is tstat = 2.44. What is the approximate one-sided P-value for this problem?
Using a 95% confidence interval, estimate the true proportion of incomplete files for ALL the banks commercial loans.
On a particular test, IQ scores for adults follow a bell-shaped (symmetric) distribution with mean=100 and a variance of 100.
A newspaper finds that the mean number of typographical errors per page is four. Find the probability that more than three typographical errors are found on a page.
What is mental accounting and how does it impact consumer decision making? How might a company take advantage of consumers' mental accounting? Give examples.
We receive a shipment of 200 units, of which 18 are defective. We test 10 units at random, and we model the number k of the units that test defective by a random variable x.
A. What is the sensitivity of self reported smoking status? B. What is the specificity of self reported smoking status?
The surgery is performed on 5 patients. Find the probability of the surgery being successful on more than 3 patients?
Develop 95% confidence intervals for the proportion of all students, the proportionof male students, and the proportion of female students who were involved in sometype of cheating.
The temp readings are normally distributed. What is the probability the temp in LA is less than 78.22 F any given day.
What are the optimal values of A and B? What is the minimum cost?
Assume that the data has a normal distribution and the number of observations is greater than fifty. Find the critical z value used to test a null hypothesis.
How do you go about calculating different probabilities--say an item was selected at random and we wanted to know how far it is from the mean or the probability that it is at least 4.5 or more?
Find the probability that the number of couples who say they paid for their honeymoon themselves is more than one.