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If 40 bags of potato chips are randomly selected, what is the probability that their mean weight is between 5.5 oz to 6.5 oz? If 40 bags of potato chips are randomly selected, what is the probability
Compute the population standard deviation for this random variable and use your answer from the previous question in order to complete the following observation: Out of a population of 10000 custome
On average, how many days did these patrons stop by to make purchases during this stormy week? What is the expectation or expected value for this random variable?
X is a normally distributed random variable with a standard deviation of 4.00. Find the mean of X if 12.71% of the area under the distribution curve lies to the right of 10.06.
The mean weight of loads of rock is 51.0 tons with a standard deviation of 6.0 tons. If 16 loads are chosen at random for a weight check, find the probability that the mean weight of those loads is
How many different ways can a teacher select 6 students from a class of 19 students to each perform a different classroom task?
Of the controls, 3 had previously experienced meningitis. Set up the appropriate contingency table and calculate and interpret the odds ratio for the relationship between meningitis and SD.
The following summary table presents the results from a repeated-measures ANOVA comparing three treatment conditions, each with a sample of n = 12 participants. Fill in the missing values in the tab
In a certain town, 70 % people support the construction of a new ballpark. If 5 people are randomly selected, what is the probability exactly 2 of them supported it?
In the instructor's answer book for a mathematics text, 8% of the answers are incorrect. Use the Poisson approximation to express the probability that there are exactly 2 incorrect answers for a hom
You calcuate the chi-square test statistic in a test of independence and determined that X²* = -4.23, with 10 degrees of freedom. Therefore, with alpha = 0.05, you know that:
In 1945 1,100 adult Americans were asked if they abstain from alcoholic beverages and 363 indicated that they were total abstainers. A recent pole asked 1,100 adult Americans if they abstain from al
State the degrees of freedom for this experiment: Using minitab or hand calculate the test statistic: (Enter to the nearest whole value) State the decision as either r for reject Ho or f for fail to
The computer-science aptitude score, x, and the achievement score, y (measured by a comprehensive final), were measured for 10 students in a beginning computer-science course. The res
Let A, B, and C be independent random variables, uniformly distributed over [0,4 ], [0,2], and [0,3] respectively. What is the probability that both roots of the equation Ax^2 + Bx + C = 0 are real?
For the funtion f(x)=6x^2, make a table of slopes of secant lines and make a conjecture about the slope of the tangent line at x=2.
The mean per capita income is 17,635 dollars per annum with a standard deviation of 891. What is the probability that the sample mean would differ form the true mean by less than 114 dollars if a sa
A consumer advocate wants to find out if motivational speakers can actually improve people's earning power. He randomly selects a group of 25 people in his city and invites them to participate in a
The standard deviation of the "fat-blocker" sample was 2.5 and the standard deviation of the control group was 2.8. Find the 95% confidence interval for the differences of the means.
Explain why the standard error of the mean decreases with increasing sample size. Provide a mathematical explanation (in words or with equations, whichever you prefer) and a conceptual explanation (
Draw the scatter plot for the variables. Compute the correlation coefficient. Use three decimal places.
Find the value of z that would be used to test the difference between the proportions, given the following. (Use G - H. Give your answer correct to two decimal places.)
Conduct all 6 steps of appropriate statistic. Be sure to label all six steps. Calculate and interpret the effect size for this test. Report the statistics as you would in a journal article.
Find the critical value from Table L for the rank correlation coefficient, given sample size n = 9 and alpha = .05.