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According to the National Institute for Occupational Safety and Health, job stress poses a major threat to the health of workers. A national survey of restaurant employees found that 75% said that job stress had a negative impact on their personal lives. A sample of 100 employees of a restaurant chain finds that 68 answer Yes when asked: Does job stress have a negative impact on your personal life? Is this good reason to think that the proportion of all employees of this chain who would say Yes differs from the national proportion, p0 = 0.75? Use a 5% level of significance.
State the Null Hypothesis and the Alternative Hypothesis.
Determine the test statistic.
Determine the P-value.
Make a decision regarding the hypotheses based on the P-value and the Level of Significance.
What is the probability that the debt for a borrower with good credit is more than $18,000?
Critically discuss the assumptions, if any, regarding a Chi-square test? What are the assumptions to apply linear regression?
If we wanted to shorten the interval of the estimation of the true mean of Saturday sales to a width of $600 in total, what should the size of our sample be to achieve it?
Let Y denote the number of students on his bus. Compute the expectations and variances of X and Y:
For a standard normal distribution, findout the percentage of data that are among 3 standard deviation below the mean also1 standard deviation above the mean.
Determining probability values using the Binomial distribution.Use the Binomial distribution to determine the probability that four or more of the contracts are in breach of the tendering guidelines.
Draw a scatter diagram of the following bivariate data.
Assume that 5,000 sales invoices are separated into four strata. Stratum 1 contains 50 invoices, stratum 2 contains 500 invoices, stratum 3 contains 1,000 invoices, and stratum 4 contains 3,450 invoices.
A candy bar manufacturer is interested in trying to estimate how sales are influenced by the price of their product. To do this, the company randomly chooses 6 small cities and offers the candy bar at different prices.
An advertising agency that serves a major radio station wants estimate the mean amount of time that the station's audience spends listening to the radio daily.
Probability using Pareto chart - Evaluate the probability of randomly selecting an adult from the sample who doesn't always eat healthy foods because he or she has no time to cook or is confused about nutrition.
A recent survey of frozen convenience meals found a correlation of r=0.768 between calories and fat content in the sampled meals.
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