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Faced with rising fax costs, a firm issued a guideline those transmissions of 10 pages or more should be sent by 2-day mail instead. Exceptions are allowed, but they want the average to be 10 or below. The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation of 4.45 pages.
a) At the .01 level of significance, is the true mean greater than 10?
b) Use Excel to find the right-tail p-value.
The t-statistics that was obtained in the study of 400 subjects was t=20, rejecting the null hypothesis and showing that the drug has a beneficial effect. Why was management upset?
Replacement times for CD players are normally distributed with mean of 7.1 years and a standard deviation of 1.4 years (based on data from "Getting Things Fixed," Consumer Reports). Find the probability that a randomly selected CD player will have..
What percentage of men are too tall to fit though a standard doorway without bending, and what percentage of women are too tall to fit through a standard doorway without bending?
The scores on the certain test are "normally distributed with mean 61" and "standard deviation 3". Determine the probability that the sample of 100 students will have the mean score of at least 61.3?
Find out the z values for 29 and 34 hours. What percent of the garages take between 32 hours and 34 hours to erect? What percent of the garages take between 29 hours and 34 hours to erect?
According to hypothetical information, 18% of all Americans have hazel colored eyes. A SRS of 25,000 Americans are surveyed and asked about their eye color
Suppose a worker needs to process 400 items. The time to process each item is exponentially distributed with a mean of 2 minutes, and the processing times are independent.
Find the value of k. Find the cdf of X. Find the mean and the variance of X.
The firm examined 35 randomly chosen fax transmissions during the next year, yielding a sample mean of 14.44 with a standard deviation of 4.45 pages.
The odds in favor of an event are the number of successes divided by the number of failures. The probability of this event occurring is the number of successes divided by the sum of the number of successes and the number of failures.
Sketch a curve, point out the distribution (i.e., normal , student T, Chi square), critical region(s). test statistics, critical values(s) and n p-value?
Create by hand decision tree for this problem and then examine decision tree to recognize optimal policy. Use TreePlan to create and solve decision tree.
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