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A random sample of 90 students at a private high school is tested and and a mean SAT score of 1030 is obtained. The average score for public high school student is 1000 (σ= 200). Is this a on
Determine the appropriate approach to conduct a hypothesis test for this claim: Fewer than 5% of patients experience negative treatment effects. Sample data: Of 500 randomly selected patients, 2.2%
The cost of a one-carat VS2 clarity, H color diamond from Diamond Source USA is $5600 ( Diamond Source website, March 2003). A midwestern jeweler makes calls to contacts in the diamond district of N
Assume the distribution of annual costs follows the normal probability distribution and the standard deviation is $ 4,500. Ninety- five percent of all students at private universities pay less than
What is the probability that an executive who speaks a foreign language has not traveled internationally??
A jar contains 1 red marble, 3 yellow marbles and 2 blue marbles. A game consists of selecting a marble and recording the color and then, without replacing the marble, drawing a second marble and re
If you pick an employee at random, what is the probability that the number of absences for this one employee would exceed 25 days?
In this turn around time, the mean turn around time was 32 hours, with a standard deviation of 9 hours. a) Construct a 95% confidence interval for the population mean turn around time.
Katherine D'Ann is planning to finance her college education by selling programs at the football games for State University. There is a fixed cost of $400 for printing these programs, and the variab
A researcher is interested in studying people's mean age in a certain region. If the population standard deviation is known to be 8 years and 1.5 year of error margin is allowed, find the minimum si
State the null and alternative hypotheses. Explain the meaning of the Type I and Type II errors in the context of this scenario.
A package of twelve Ping-Pong balls contains two defectives. An inspection procedure to check on the quality of the package is to select randomly two Ping-Pong balls for inspection and to reject the
The mean amount spent by a family of four on food per month is $700 with a standard deviation of $85. Assuming that the food expenditures are normally distributed, what is the proportion of families
Is there evidence that the population mean amount is less than 36.5 hours? (Use a 0.05 level of significance.) Determine the p-value and interpret its meaning.
In a recent study of 44 eighth graders, the mean number of hours per week that they watched television was 19.5 with a standard deviation of 5.1 hours. Find the 98% confidence interval for the mean
Is there evidence that the population mean retail value of the greeting cards is different from $2.50? (Use a 0.05 level of significance.)
100 trials are run for a Poisson process. If the probability of a success is 0.02, what are the mean number of successes and the standard deviation? What is the probability distribution for the numb
During a busy period at an airport, planes arrive at an average rate of 10 an hour. What is the probability distribution for the number of planes arriving in an hour?
Because the sample size is 64, do you need to be concerned about the shape of the population distribution when conducting the t test in (a)? Explain.
A machine makes a product, with 5% of units having faults. In a sample of 20 units, what is the probability that at least 1 is defective? In a sample of 200 units, what is the probability that at le
A set of observations follow a Normal distribution with mean 40 and standard deviation 4. What proportions of observations have values: (a) greater than 46, (b) less than 34, (c) between 34 and 46,
There is a 90% chance that the number of meals served in a week exceeds what value? There is a 90% chance that the number of meals served will fall within what range?
In estimating the 95% confidence interval estimate of the proportion of workers absent more than 10 days last year what is the upper limit of the confidence interval?
There are two coin purses. The first coin purse contains a penny (P) and a nickel (N). The second coin purse contains a dime (D) and a quarter (Q).
A machine makes parts with a variance of 14.5 cm in length. A random sample of 50 parts has a mean length of 106.5 cm. What are the 95% and 99% confidence intervals for the length of parts?