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The ages of the actresses when they won an acting award is summarized by the statistics n=80, x= 35.8 years, and s=11.1 years. Use a 0.01 significance level to test the claim that the mean age of ac
A sample of 20 apartments had a mean cleanup and redecorating time of 13.5 hours with a standard deviation of 1.5 hours. Does use of the "fee and fine system" decrease the cleanup and redecorating t
Does a scatter plot indicate a correlation? If so, is it positive or negative? Find r, check for its significance at alpha = 0.05; use "critical values for the Pearson Correlation Coefficient" table
The Corporate Lawyer, a magazine for corporate lawyers, would like to report the mean amount earned by lawyers in their area of specialization. How large a sample is required if the 97 percent leve
Of a random sample of 90 firms with employee stock ownership plans, 40 indicated that the primary reason for setting up the plan was tax related. Develop a 90 percent confidence interval for the po
Captain D's tuna is sold in cans that have a net weight of 8 ounces. The weights are normally distributed with a mean of 8.025 ounces and a standard deviation of 0.125 ounces. You take a sample of 3
A statistics instructor collected data on the time it takes the students to complete a test. The test taking time is uniformly distributed within a range of 35 minutes to 55 minutes. Determine the
Assume that you plan to use a significance level of = 0.05 to test the claim that p1 = p2. Use the given sample sizes and numbers for successes to find the P-value for the hypothesis test. n1 = 200
The computer chips in notebook and laptop computers are produced from semiconductor wafers. Certain semiconductor waiters are exposed to the environment that generates up to 100 possible defects per
The probability that an individual egg in a carton of eggs is cracked is 0.03. You have picked out a carton of 1 dozen eggs (that's 12 eggs) at the grocery store. Determine the probability that at
Identify the null and alternative hypothesis. Determine the test statistic. Determine the critical value.
What is the number of trials (n), probability of successes (p) and probability of failures (q), respectively? Find the probability that she returns at most 8 of the 10 serves from her opponent.
Because the confidence interval limits _______ zero, there ____ a significant difference between the successes rates of the men and women tennis players.
Find the 80th percentile of the pecan tree height distribution. If a random sample of 64 pecan trees is selected, what is the standard deviation of the sample mean?
If I roll a fair die 1000 times find the probability the number of threes is strictly between 125 and 165 using excel commands.
The number of nonconforming switches in samples of size 150 are shown below. Construct a fraction nonconforming control chart for these data. Does the process appear to be in control?
(a) Using exponential distribution estimate the average time using the sample mean.
A Normally distributed quality characteristic is monitored throughuse of an x bar and R chart. These charts have the followingparameters n=4
Suppose that 4 candidates run for the governor of a state. How many ways are there in which the numbers of their received votes can be ordered, that is, who is No. 1, who is No.2, and so on. Note t
Give the coefficient of x^k in the expansion of (x + 1/x)^99, where k is an integer between 0 and 99 inclusive. Give explanation for your answer.
Suppose that the probability that an incoming email is a spam is p(S), that the probability that the word w occurs in the subject line of the spam is p(w), and that q(w) is the probability that the
Suppose that the universal address set address of a vertex v in an ordered rooted tree is 3.2.5.1.5. Find
Test scores for a calculus class had a mean of 69 with a standard deviation of 3.7. Suppose a student gets a 60 on the statistics test and a 87 on the calculus test. Calculate the z-score for each t
Thirty-one percent of those surveyed say they are postponing or reducing the amount of vacation. Twenty officers participating in the survey are randomly selected. The random variable represents the
Suppose f(x, y)=1 & g(x, y)= x+y 0< x <1, 0< y<1 Determine the most powerful test of size alpha =.05 of hyp: (X, Y) ~ f vs. alt: (X, Y) ~ g.