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Scatter plot and correlation:
Build a scatter plot, Find the value of the linear correlation coefficient r, and find the critical value of r using α=0.05. Determine whether there is sufficient evidence to support a claim of a linear correlation between the two variables.
CPI and Pizza the paired values of the consumer price index (CPI) and the cost of a slice of pizza are listed below: Is there a linear correlation between CPI and the cost of a slice of pizza?
CPI
30.2
48.3
112.3
162.2
191.9
197.8
Cost of Pizza
0.15
0.35
1.00
1.25
1.75
2.00
We want to estimate the population mean within 5, with a 99% confidence level. The population std dev is estimated to be 15. How large is the required sample size?
There are two telephone lines A and B. Let E1 be the event that line A is being used and E2 be the event that line B is being used
Use the continuity correction and describe the region of normal curve that corresponds to the indicated binomial probability. The probability of more than 50 right answers.
Based on the answers to a through d, decide whether or not to reject the null hypothesis at the given significance level. Explain your conclusion in the context of the problem.
Thirty-two samples of 8 items each were collected from a process. The average sample mean is 12 and the average range is 0.10.
What is the probability of receiving more than three pieces of junk mail today?
Compute the probability that student eats at fast food restaurant 2 or more times per week?
A random sample of 48 managers of large hotels has mean X‾= 5.91. The null hypothesis for the researcher's test is?
Hours worked is important predictor of amount of sales.
A sample of 100 observations has a mean of 2.99 and a standard deviation s equal to 0.5 Conduct the following test of hypotheses about the corresponding population mean at a level of significance of α = 0.2
A company wants to know if minorities are more likely to be in certain job categories than others. Their data base codes employees 1 for clerical, 2 for custodial, and 3 for manager. A logistic equation was fit to the data with SPSS.
A sample of 50 provided a sample mean of 14.15. The population standard deviation is 3.
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