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1. A fast-food franchiser is considering building a restaurant at a certain location. Based on financial analysis, a site is acceptable only if the number of pedestrians passing the location averages more than 100 per hour. A random sample of 50 hours produced a sample mean of 110 pedestrians per hour. Historical studies have shown that the population standard deviation is 12 pedestrians per hour.
a. Does this data provide sufficient evidence to establish that the site is acceptable? Use a 0.05 level of significance. State your null and alternate hypothesis, and further, state your conclusion in non-technical terms. Also, what is the p-value for this hypothesis test?
Describe the purpose of transforming raw scores into standard scores. Describe what "normal distribution" means.
What sampling method did you use? Construct a 95% confidence interval for the true population proportion of the SUV's. What sample size would be needed to ensure an error of +/- 0.025 with 95% confidence?
A researcher has a series of Likert-scale items and a measure of frequency of absenteeism. He uses each of the Likert-scaled items in a separate bivariate correlation with absenteeism without testing for the assumptions of linear relationships. Is th..
When using the normal distribution (empirical rule) to obtain the bounds for 99.73 percent of the value in a population, the interval generally will be ______the interval obtained for the same percentage if Chebyshev's theorem is assumed., shorter..
The random variable x has a normal distribution with mean=30 and standard deviation = 30. Find the probability that x assumes a value more than two standard deviations from its mean more than three standard deviations from the mean.
When modelling E(y) with single qualitative independent variable, number of 0 - 1 dummy variables in model is equal to number of levels of qualitative variable.
An electronic circuit board fails randomly with failure rate of λ=0.00021 /h. When it fails it is replaced by a new board.
A prison official wants to estimate the proportion of cases of recidivism. In examining 250 convicts there are 65 cases. with 99% confidence interval what is the range? How do you figure this type of problem?
Is there evidence that the population mean is above $300, if X (bar) = $305.11 and s = $43.20?
What is the relationship between confidence intervals and hypothesis testing? How are they the same? How are they different?
The winning team's score in 13 high school basketball games was recorded. If the sample mean is 54.3 points and the sample standard deviation is 11.0 points, find the 98% confidence interval of the true mean.
Given the following number of hours between breakdowns for 4 machines, are the machines significantly different? If so, how are they different? Which machine is the best? Which machine is the worst?
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