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A statewide real estate agency, New Colony, specializes in residential home sales in southern California. Records indicate the mean selling time of homes is 90 days. Because of recent water concerns, the agency believes that the mean selling time may have increased. A regional survey of 100 homes sold recently revealed that the mean selling time was 94 days with a standard deviation of 22 days. At a .1 significance level, can we conclude that the mean selling time has increased?
The progress report of a research analyst to the supervisor stated: "All the estimated regression coefficients in our model with three predictor variables to predict sales are statistically significant.
Proportion nonconforming is 0.10. what is the probability of (1) 1 nonconforming unit in the sample (b) 1 or less (c) 2 or more?
Standard deviation of 3.2 days. If a nursery plants 100,000 of these seeds, how many will germinate in less than 20 days?
Based on these findings, can we reject the company's claim that the drug is equally effective for men and women? Use a 0.05 level of significance.
Compute the value of the discriminant and give the number of real solutions to the quadratic equation
Provide an example and explain. Why do statisticians play only a limited role in deciding whether statistical significance requires a business action?
Is there evidence to suggest a difference in the mean waiting times at the four body shops? Use the .05 significance level.
Using = .05, what is the critical value for the test statistic? (+ or -). State the rejection rule: Reject H0 if z is the lower critical value or the upper critical value.
A survey last week revealed that out of 400 viewers contacted, 94 watched the news on WBEN. Can we conclude that the percent of viewers has increased? Use the 0.05 significance level.
Identify a business research topic and define the research questions for the identified problem or opportunity
A psycologist wants to research whether wearing cologne helps men attract women. What would be null hypothesis in this sturday and what would be the research hypothesis?
a new computer virus attacks a folder consisting of 200 files. each file gets damaged with probability 0.2
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