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The average gasoline price of one of the major oil companies has been $2,25 per gallon. Recently, the company has undertaken several efficiency measures in order to reduce prices. Management is interested in determing whether their efficiency measures have actually reduced prices. That is, the alternative hypothesis is that the current average price is less than $2.25. A random sample of 49 of their gas stations is selected and the average price is determined to be $2.20. Assume that the standard deviation of the population is $0.14.
At 95% confidence, test to determine whether the measure were effective in reducing the average price.
The manager wants to know the probability that any particular cookie will have fewer than 5. What type of probability distribution will most likely be used to analyze the number of chocolate chips per cookie?
The statistical research was done primarily through the internet from governmental regulated sources. Estimates were used in consideration of absence of actual information.
A university club consists of 4 men and 6 women. Two members are chosen at random without replacement. Let X = 0 if first person chosen is male, 1 if first person chosen is female. Y = 0 if second person chosen is male, 1 if second person chosen i..
Construct a 99% confidence interval for the average length of usage time to recharge.
Determine the critical region and critical values for z that would be used to test the null hypothesis at the given level of significance, as described in each of the following:
Is there evidence of a difference in the median performance between the two methods? (Use x = 0. 05).
Find the value of x that corresponds to each of these standard scores z = -1.85.
Suppose the least squares regression equation is Y' = 1,202 + 1,133X. When X = 3, what does Y' equal?
In a survey on the quality of customer service at Car Toys, customers were asked to rate the service on a scale from 1 to 10, with 10 being that a customer was completely satisfied.
Graphical method to solveout the linear programming problem. Describe where the following TEO constraints intersect.
A university wants to determine the proportion of students who use a cash card to pay at the university food service. Out of 100 students surveyed, 65 students use a cash card. Estimate the value of the population proportion.
Experience raising New Jersey Red chickens revealed the mean weight of the chickens at five months is 4.35 pounds. The weights follow the normal distribution.
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