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During the winter of 2010-2011, the average utility bill for Delaware residents was $186 per month. A random sample of 40 customers was selected during the winter of 2011-2012, and the average utility bill was found to be $178.10 with a sample standard deviation of $22.40.
a. Using α = 0.05, does this sample provide enough evidence to conclude that the average utility bill in Delaware was lower in the winter of 2011-2012 than it was in the winter of 2010-2011?
b. What is the p-value for this test?
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Construct a 90% confidence interval for the population proportion p . Does your result agree with your conclusion in part (a)?
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The Roller Products Company produces roller skates and skateboards. It has three production lines. Production line 1 makes skateboard platforms.
What value is standard deviation for this data? What type of probability is this?
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Estimate the 95% confidence interval for the proportion of the electorate that support this policy.
If a randomly selected student is a female student, what is the probability she is a C student?
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