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Using this sample, a 90 % confidence interval for the percentage of college students who smoke is found to be 17.79 % to 20.21 %. Based this interval, can we conclude that the claim that 17 % of all
Suppose you were given the task of estimating the proportion of drivers in Troy, AL who text while they drive. Discuss what factors you must consider and how you would accomplish this.
The heights and weights of 11 men between the ages of 21 and 26 were measured. The data are presented in the table below.
In designing a fraction non comforming chart with centre line at p=0.2 and three sigma control limits, what is the sample size required to yield a positive lower control limit? What is the n value n
Find the margin of error for the given values of c,s, and n c=0.80 s=4 and n=8 The margin of error is ____ (round to one decimal place as needed)
What is the total area under the normal curve?
Assume the random variable x is normally distributed with mean u=87 and a standard deviation o=5. Find the indicated probability P(73< x < 82) round to four decimal places
A population has a mean u=72 and a standard deviation o=25. Find the mean and standard deviation of a sampling distribution of sample means with sample size n=250.
Find the z-scores for which 12% of the distribution's area lies between -z and z. Use a comma to separate answers as needed. round to two decimal places as needed
For the standard normal distribution shown on the right, find the probability of z occuring in the indicated region. Its a bell shaped graph, everything to the left is shaded, and it has a number pa
Use a table of cumulative areas under the normal curve to find the z-score that corresponds to the given cumulative area. If the area is not in the table, use the entry closest to the area. If the a
a) The probability that the mean height for the sample is greater than 65 inches is
Out of 87 observations, 67% were successes. Ho: p = 0.54. Confidence level: 98%. What is the value of the appropriate test statistic used to test the null hypothesis?
What is the distribution of the case described here? "Mrs. Shop wants to buy three high quality fountain pens at a traditional market when she travels to a foreign country."
In a survey of 3003 adults, 1450 say they have started paying bills online in the last year. Construct a 99% confidence interval for the population proportion. Interpret the results.
A camera manufacturer just shipped a batch of 36 digital cameras to local retailers and seven of the cameras have a defective sensor. Cutler Electronics received eight of these digital cameras. What
The monthly incomes for 12 randomly selected people, each with a bachelor's degree in economics, are shown on the right.
A company that bakes chocolate chip cookies averages 5.2 chocolate chips per cookie. Assume that the number of chocolate chips per cookie follows the Poisson distribution. What is the probability th
According to the Centers for Medicare & Medicaid Services, 16% of nursing homes received five stars in overall ratings in 2011. A random sample of six nursing homes was selected. What is the sta
Assume that the number of customers who arrive at a water ice stand follows the Poisson distribution with an average rate of 6.4 per 30 minutes. What is the probability that exactly five customers w
The professor randomly selects five students to work together on a group project. What is the standard deviation of this probability distribution if selecting a business major is defined as a succes
The probability of low, moderate, and high demand is 30%, 45%, and 25%, respectively. Determine the EMV for the new product.
Prove that the velocity induced region surrounding a doubly infinite vortex sheet of constant strength satisfies the equation of continuity everywhere.
a) what assumptions about the population should we be willing to make if a margin of error is desired b) using 95% confidence , what is the margin of error? c) Using 99% confidence, what is the marg
Accounting procedures allow a business to evaluate their inventory at LIFO (Last In Fi rst Out) or FIFO (First In First Out). A manufacturer evaluated its finished goods inventory (in $ thousands) f