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D" size batteries produced by MNM Corporation have had a life expectancy of 86 hours. Because of an improved production process, it is believed that there has been an increase in the life expectancy of its " D" size batteries. A sample of 25 batteries showed an average life of 88.5 hours. Assume from past information that it is known that the standard deviation of the population is 7hours
a. formulate the hypotheses for this problemb. compute the test statistic, and at 95% confidence, test the hypothesesc. What is the p-value associated with the sample results? What is your conclusion based on the p-value?
The animal colony in the reseach department contains 20 male rats and 30 female rats. Of the 20 males, 15 are white and 5 spotted. Of the 30 females, 15 are white, and 15 are spotted.
How large a sample size will need to be selected if we wish to have a 99% confidence interval with a margin for error of .10 oz?
What percentage of the dealer prices for the Mercedes CLK350 Coupe is more than $43,000 and hence priced out of the BMW 3 Series Coupe 335i market?
Find the probability that the age of a randomly selected CEO will be between 56-57 y/o. (round to 4th decimal) The probability a randomly selected CEO will be between 56-57 y/o is?
which is a value often used for the upper limit of the range of normal values. What do the results suggest about the sample group?
Management wishes to know how many casks of each wine to make to maximize total. profit. Prepare the linear programming model for this problem.
No, there is not sufficient information to reject the hypothesis that the proportion of cats and the proportion of dogs that sleep more than 10 hours per day are the same because the test value -0.65 is inside the acceptance region (-1.96,1.96).
Hugger Polls contends that an agent conducts a mean of 53 in-depth home surveys every week. A streamlined survey form has been introduced, and Hugger wants to evaluate its effectiveness.
The cholesterol concentration in the yolks of each of a sample of 22 randomly selected eggs laid by free range chickens were found to have a mean value of 9.38 mg/g of yolk and a standard deviation of 1.62 mg/g.
What is the probability that the graduate selected will be a male who is not a member of a sports team? What is the probability that the graduate will be either a female or a member of a sports team?
Results were analyzed using one -way ANOVA and included SSTR =7 , 102 and SSE = 10 ,511. Are all 8 tapes equally appealing on average? Determine p value?
Estimate with 95% confidence the mean reduction in time it takes for someone who has taken the sleeping pill to fall asleep.
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