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Use the reported numbers as the population proportions and assume that samples of 300 adults and 300 youths will be used to learn about attitudes toward Internet security.
How should you calculate confidence interval using quantiles from a t-distribution and with how much degree of freedom? Is it approprait to use in calculating the confidence of interval quantiles
A) What is the lottery's expected profit per ticket? B) What is the lottery's standard deviation of profit per ticket?
The random variable X has a binomial distribution with parameters n=100 and p=0.10. What distribution model would be appropriate to use to calculate an approximate value for the probability P(X=10).
The random variable X has a Poisson distribution with mean 40. Give an approximate value of the probability P( 37 less than or equal to X less than 41 ) using the central limit theorem with a cont
In this problem, we explore the effect on the standard deviation of adding the same constant to each data value in a data set. Consider the following data set.
Give an 80% confidence interval for the total number of signatures. How (if at all) does the non-normality of the Number of signatures (with a greatest frequency at the upper end - 42) affect your a
Management will become concerned if more than 10% of the widgets from a particular machine are out of tolerance. Calculate the 5th percentile and the 95th percentile to find the measurements you wo
What is the probability that a randomly selected family owns both a dog and a cat? What is the conditional probability that a randomly selected family doesn't own a dog given that it owns a cat?
If an experimenter crosses intelligence with attractiveness in a factorial design in which intelligence has three levels (high, medium, low) and attractiveness has two levels (high and low) the stud
The metropolitan area of Los Angeles-Long Beach, California, is the area expected to show the largest increase in the number of jobs between 1981 and 2013. The number of jobs is expected to increase
If the Bonferroni procedure is used to maintain an overall significance level of .05 for three comparisons, the significance level for each comparison will be set at:
Assume that three industrial processes (A,B and C) are independent. If the probability of successfully working for 8 hours is 0.99 for process A, 0.95 for process B and 0.80 for process C, then
If independent random samples of size n1=n2=8 come from normal populations having the same variance, what is the probability that either sample variance will be at least 7 times as large as the othe
What is the weighted mean price per share? (Round your answer to 2 decimal places. Omit the "tiny_mce_markerquot; sign in your response.)
Compute the row percentages and identify the percent frequency distributions of in-come for households in which the head is a high school graduate and in which the headholds a bachelor's degree? fro
An electrical engineer has two boxes containing different types of resistors. the first box contains 3 resistors of one type and the second box contains 2 resistors of another type.
The owners of a two-person business make their decisions independently of each other and then compare their decisions. If they agree, the decision is made; if they do not agree, then further conside
With 90% confidence levels, determine wheter the two samples are statistically the same or different. Find the range for the true(or population) mean for each set with 90% confidence levels.
Consider a population having a standard deviation equal to 9.90. We wish to estimate the mean of this population. How large a random sample is needed to construct a 95 percent confidence interval for
A consumer testing agency obtains 4 cars randomly from each of the folliwng three makers: 1, 2, 3. We wish to compare gasoline efficincy of the cars produced by the three makers. Suppose the mean me
A new drug is claimed to have effect on reducing heart rate for patients with unstable angina by 15 beats per minute over 24 hours. Suppose heart rate(beat per minute) of population follows a normal
1. Students take an average of 45 minutes and standard deviation of 8 minutes to complete a certain statistics test. If a student is selected at random, what is the probability that the student take
Estimate the mean and standard deviation of the time-to-failure for Network A, the time-to-failure for Network B.
Suppose probability samples of size n=2 are selected from {1, 2, 3, 4} with probabilities d1=.4, d2=.4, d3=.1, and d4=.1. Demonstrate that tau_hat is still an unbiased estimator