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A test was conducted to determine whether gender of a spokesperson affected the likelihood that consumers would prefer a new product. A survey of consumers at a trade show employing a female spokesperson determined that 70 out of 1500 customers preferred the product, while 62 of 180 customers preferred the product when a male spokesperson was employed. At the 0.01 level of significance, do the samples provide sufficient evidence to indicate that on the average, fewer consumers prefer a new product when the spokesperson is female?
Construct a 99% confidence interval on the difference of the average ages for the viewers of the two TV programs. How can you interpret this interval?
Mike works in a quality at a well known saw blade company. An inpsector on his team has uncovered an issue with the kerf dimension on the bandsaw blade line.
In the boom years of the late 1990s, it was often said that rapidly increasing stock prices were responsible for much of the rapid growth of real GDP. Explain how this could be true, using aggregate demand and aggregate supply analysis
Compute the optimal production quantities for the company?
If appropriate, use the Tukey-Kramer procedure to examine differences among machines. What can you conclude about the effects of machines on breaking strength? Explain.
At least 14 units of B and no more than 20 units of A must be used. Each unit of A weighs 5 kg and each unit of B weighs 10 kg. How many units of each type of raw material requires?
Compute b1, slope of an OLS regression line using dollars spent as dependent variable (Y) and age as independent variable (X).
The Sony corporation produces a Walkman that requires two AA Batteries. The mean life of these batteries in this product is 35.0 hours. The distribution of the battery lives closely follows the normal probability distribtion with a standard deviat..
Use normal disrtibution of fish lengths for which the mean is 8 inches and the standard deviation is 5 inches. Assume the variable x is normally distributed.
Draw the histogram for these data using an initial class boundary of and a class width of . Note that you can add or remove classes.
In order to compare the mean charges for the three groups, the data will be subjected to an analysis of variance. Write the null hypothesis tested by the ANOVA.
A box contains 5 red marbles and 10 blue marbles. You can take 3 marbles at random, without replacement. What is the probability of winning this game?
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