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Two machines are supposed to be producing steel bars of approximately the same length. A sample of 35 bars from one machine has an average length of 37.013 inches, with a standard deviation of 0.095 inches. For 38 bars produced by the other machine, the corresponding figures are 36.974 inches and 0.032 inches.
Using the 0.05 level of significance, test the null hypothesis that the population means are equal. Using the appropriate statistical table, what is the approximate p-value for this test?
Construct and interpret the 95% confidence interval for the difference between the population means.
the same six testers rated the taste of two ice creams. taste ratings are not normally distributed so a t-test should
a linear program has been solved and sensitivity analysis has been performed. the ranges for the objective function
Independent samples are taken of a random variable X.- If the PDF of is uniform over the interval - Write the approximation as an equation.
Suggest some differences between online and classroom students that might explain why online students do better.
Be sure to include information about how you would use the concept of probabilities to apply to profiles for hiring more satisfied individuals.
Suppose that A makes a statement, and then D says that C says that B says that A was telling the truth. What is the probability that A was actually telling the truth?
Twelve students randomly selected from the entering class of college had the following SAT scores in math and English population mean=500, sigma=100
Draw the frequency polygon for these data using an initial class boundary of 21.5, an ending class boundary of 46.5 and 5 classes.
a presidental candidate conducts a poll of likely voters in ohio to determine their mean ageanswer the following1.
The sample mean and standard deviation are 20 days and 4 days, respectively. Using a confidence interval of 90%, construct the interval.
a coach uses a new technique in training middle distance runners. the times for 8 different athletes to run 800 meters
If you take a random sample of size 100 from this population, find the probability that the sample mean falls between 48 and 51.
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