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In a premlinary test of the Microsort method of gender selection 14 couples were treated and 1.3 of them had baby girls. If we plan to use the normal approximation to the binomial distrubtion for fi
Estimate the critical value of t for a 99% confidence interval with degrees of freedom (df) equal to 102.
The Journal of American Medical Association reported on an experiment intended to see if the drug Prozac could be used as a treatment for the eating disorder aneorexia nervosa. Subjects which were w
The Centers for Disease Control and Prevention reported a survey of randomly selected Americans age 65 and older, which found that 411 of 1012 men and 535 of 1062 women suffered from some form of a
A company is sued for job discrimination because only 19% of the newly hired candidates were minorities when 27% of all applicants were minorities. They want to determine if there is strong evidence
According to the Law School Admission Council, in the fall of 2006, 63% of law school applicants were accepted to some law school. The training program Satisfaction claims that 163 of the 240 studen
Use this information about the overhead reach distances of adult females mean = 205.5 cm SD= 8.6 cm and over head reach distance are normally distrubted.
Find the indicated z score. The graph depict the Standard normal distrubiton of blood count scores with mean of 0 and SD of 1.
Sixty percent of the students at a particular community college are female. If 12 students at that community college are randomly selected, find the probability that 5 will be female.
Sixty percent of the students at a particular community college are female. If 12 students at that community college are randomly selected, find the probability that 5 will be female. Use Appendix T
Assume that women's heights are normally distrubted with a mean =62.4 inches and a SD given by =2.6 inch. If a woman is randomly selected find the probability that her height is less than 63 inch. If
A researcher believes that the retail price of new identical automobiles differs between an Urban location and a Suburban location. A random sample of 25 cars sold at Urban locations gave a sample m
An instructor believes that 20% or less of the students who finish a statistics course get an "A" grade. A sample of 90 students was taken and 25 of the students in the sample received an "A" grade.
A lathe is considered to be in perfect adjustment if the average length of the steel bars it cuts is 6 centimeters. A sample of 60 bars is selected randomly and measured. It is determined that the a
The guidance system of a ship has four modules that must maintain all function properly for the system to work. Two of the modules have reliability of .85, the other two have reliability of .95 eac
The Readylite Company produces a flashlight in which product managers are trying to decide how long a warranty to issue. If the managers believe the life of the flashlight follows a normal distribu
If a company knows that its new employees have an eighty-five percent learning rate and the first time they perform the task it takes 200 hours. How long will it take to perform the tenth repetition
The number of plumbing repaie jobs performed by Angur's Plumbing Service in each of the last four years is listed below:
In a second grade class containing 12 girls and 10 boys, 2 students are selected at random to give out the math papers. What is the probability that the second student chosen is a boy, given that th
Assume the variable is normally distributed. Please put you answer in decimal form. b. If a random sample of 15 proofreaders is selected, find the probability that the mean age of the proofreaders i
Suppose the amount of a popular sport drink in bottles leaving the filling machine has approximately a normal distribution with mean 101.5 milliliters (ml) and standard deviation 1.6 ml.
Suppose that the company conducting the survey wants to test the hypothesis that the true population proportion of game players who believe DLC is "very important" is 0.5. Calculate the value of the
Calculate the lower bound of a 90% confidence interval for the difference in mean weight loss for the two groups.
Most video games have several difficulty settings, from "Easy" to "Hard" (many of these have very colorful names). A video game designer wants to determine how to structure the difficulty levels for
Here is a simple probability model for multiple-choice tests. Suppose that each student has probability p of correctly answering a question chosen at random from a universe of possible questions.