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An engineering firm is evaluating their back charges. They claim that their average back charge is $1800. They randomly select 40 customers, and calculate the sample mean back charge to be $1925. If the standard deviation of back charges is $600, and alpha = 0.05, test the claim of the engineering firm. Perform an appropriate hypothesis test, showing the necessary calculations and/or explaining the process used to obtain the results.
Explain what these terms mean in describing the distribution of the sales reps' salaries.
Your employer asks you to determine whether current salaries (DV) can be predicted from years of experience (IV) What is the right statistical test one should use and why?
The diameters of bolts produced by a certain machine are normally distributed with a mean of 0.30 Inches and a standard deviation of 0.01 inches.
Make a List of type of possible errors. Assume that you were interested in knowing the mean score for a certain quiz in a statistics class.
Assume gasoline prices for a region are normally distributed. Do the data you obtained provide enough evidence to reject the claim?
Determine whether the evidence is enough to reject the salesperson's claim. Establish the Null and alternative hypothesis, and choose the right test statistics.
Compute mean, variance, and standard deviation of number of parents who correctly recognize their child's illness. Determine the probability at most five parents are correct.
An aircraft manufacturer is attempting to determine if the average leg length of the adult male has changed from 44". A sample of 81 men was selected randomly
A small town has a population of 20,000 people. Among these 1,000 regularly visit a popular local bar. A sample of 100 people who visit the bar is surveyed for their annual expenditures in the bar.
A hypothesis is being conducted. The p-value was found to be 0.0768. For which of the following levels of significance will the null hypothesis be rejected?
Using your own experience, estimate the probability the local weather forecast is correct. Explain the rationale behind your estimate.
What is the sensitivity and specificity of the test? Suppose that 1 out of 500 infants are born with Down's syndrome.
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