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If the mailing list can be considered a random sample of the population, what is the mean number of high school dropouts who will receive the flyer?
Assume that a is 0.05 for a two-tailed test. Based on your analysis, write three Step 5 type statements summarizing your findings.
Use the variable GRASS as your independent or grouping variable (1 = legal; 2 = not legal). Investigate whether there is a significant difference between these two groups in terms of their age (AGE)
Let x1, x2, and x3 be independent binary random variables taking 1 with probability p and zero with probability 1-p. Define two estimators p hat 1 = x bar and p hat 2 = (xbar/2) + (1/4), where
Consider a discrete random variable, X having the following probability function. f(x)= [(x+6)/20] for x\varepsilon{-4,0,6}
Cars arriving for gasoline at a Shell station follow a Poisson distribution with a mean of 6 per hour. Determine the probability that over the next hour, only one car will arrive.
What proportion of the rods has length that is outside the tolerance limits of 5.9 inches to 6.1 inches? To what value does the standard deviation need to be reduced if 99% of the rods must be within
The mean number of patients admitted per day to the emergency room of a small hospital is 0.5. If, on any given day, there are only 7 beds available for new patients, what is the probability that th
Describe how you could determine if the fishing is better at Pyramid Lake from a boat or from the shore by creating either an independent or dependent sampling plan.
A certain typing agency employs two typists. The average number of errors per article is 4.1 when typed by the first typist and 1.5 when typed by the second. If your article is equally likely to be
Cars arriving for gasoline at a Shell station follow a Poisson distribution with a mean of 7 per hour. Determine the probability that over the next hour, only one car will arrive.
Complaints about an Internet brokerage firm occur at a rate of 7 per day. The number of complaints appears to be Poisson distributed. Find the probability that the firm receives 31 or more complaint
Raftelis Financial Consulting reported that the mean quarterly water bill in the united States is 47.50(U.S. News&report , august 12, 2002) Some water systems are operated by public utilities, w
Calculate percentage distribution for the independent variable. Calculate the expected frequency (fe) for this distribution. What is the degree of freedom? What is the Chi-square critical if alpha is
A researcher tests the question of whether participation in community-sponsored services ( such as card games, field trips, etc..) increases the quality of life (as rated from 1 to 10) for older Am
1.What is the standard error sm? 2. What is the value of the t statistic? 3. What is the critical t value? 4. Would you reject or retain the null hypotheses?
A research wants to study the amount of money spent on food among undergraduate students and undergraduate student athletes. Select the following statement that represents the null hypothesis.
We wish to estimate the prevalence of asthma at a large school of 2850 children. We think it will be around 25% and want a sample size that allows the 99% confidence limits to be within 5% of our fi
If a= 0.05 and the direction of the hypothesis is one-tailed and greater than, your critical values for a Z-distribution will be
Let X be a random variable with a continuous uniform distribution on the interval (1,a) where a>1. If E(X)=6Var(X), find a.
The manufacturer of cans of salmon that are supposed to have a net weight of 6 ounces tells you that the net weight is actually a normal random variable with a mean of 5.98 ounces and a standard dev
If a= 0.05 and the direction of the hypothesis is two-tailed, your critical values for a Z-distribution will be?
A researcher wants to know if older adults exposed to community- based, long-term care score higher on the Margolis Scale of Social Activities than do older adults receiving in-home, long-term care.
A simple random sample from a population with a normal distribution of 103 body temperatures has x(bar)= 99.10F and s=0.69F. Construct a 90% confidence interval estimate of the standard deviation of