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Employer A states the average number of days missed in a year by each staff member is 4.0. Office personnel randomly sampled a portion of their attendance records to determine if this claim was accurate. For the previous year, the following data was obtained from the sample group, regarding absences for that year: 4, 4, 3, 2, 6, 8, 7, 1, 9, 3, 1, and 6. At the .05 level of significance, is there convincing evidence that the number of absences per employee has increased?
Calculate sample proportion and then also calculate a 99% confidence interval for true population proportion, p.
Explain probability distribution of X (name and parameters).
A local tire dealer wants to predict the number of tires sold each month. He believes that the number of tires sold is a linear function of the amount of money invested in advertising.
what is the probability that a single fisherman's catch is less than 31.5 pounds? what is the probability that the sample of 30 fisherman's average catch is less than 31.5 pounds?
Calculate the probability that a randomly chosen sample of 17 games would have a sample mean less than the one you calculated in this exam. Use the standard normal distribution.
Does this sample provide enough evidence to conclude that self-esteem scores for these adolescents are significantly different from those of the general population? Use a two-tailed test with x =.01.
You plan to conduct a survey to find what proportion of the workforce has two or more jobs. You decide on the 95 percent confidence level and state that the estimated proportion must be within 2 percent of the population proportion.
A local bank reported to the federal government that its 5,246 saving accounts have a mean of $1,000 and standard deviation of $240.
What was the highest score earned on the exam? According to Chebyshev's Theorem, how many students scored between 42 and 74?
The Ohio Department of Highways is in the process of selecting a new paint for highway use. Four different paint companies have been contact regarding this need and each of the companies has supplied paint for testing.
Hours worked is important predictor of amount of sales.
Find an equation of the least squares regression line. Please show your work. Is there a linear correlation between "x" and "y" at the 0.01 significance level? Please justify your answer.
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