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Q1) Owner of Limp Pines Resort desired to know average age of its clients. Random sample of 25 tourists is taken. It illustrates a mean age of 46 yrs. with stand. dev. Of 5 yrs. Width of a 98% Cl for true mean cliet age is approximately..............yrs.
a) +or-2.06 b) +or-2.33 c) +or-2.49 d) +or-2.79
Q2) What sample size would be needed to evaluate true proportion of American female business executives who prefer title "Ms.", with an error of ±0.025 and 98 percent confidence
Q3) Financial institution desires to evaluate mean because balances owed by its credit card customers. Population standard deviation is evaluated to be $300. If 98% confidence interval is used and interval of +or-$75 is desired, how many cardholders must be sampled?
a) 3382
b) 62
c) 629
d) 87
Q4) Jolly Blue Giant Health Insurance is concerned about rising lab test costs and would like to know what proportion of lab test for prostate cancer are actually proven right through subsequent biopsy. JBHI demands sample large sufficient to make sure error of +or-2% with 90% confidence. Determine the essential sample size?
a) 2,401
b) 1,692
c) 1,604
d) 609
A sample of 81 business managers on the West Coast had an average breakfast cost of $7.65. 13. At a = 0.05, what is the test value?
Which measure of association would the researcher use to compare the relationship between the IV and DV? Why?
Is global F ratio significant? Identify this F ratio, and describe whether it is important.Is coefficient for X1 (productivity) significant? How do you know? Mention its t value and accompanying P-value.
Plot fitted values against residuals. Does this plot point out any problems with homoscedasticity?
The MacBurger restaurant chain claims that the waiting time of customers for service is normally distributed,
Assume you are using ANOVA to study some phenomenon. There are three treatment levels and a total of 17 people in the study. Complete the following ANOVA table.
A professor of math refutes the claim that the average student spends 3 hours studying for the midterm exam. Which hypothesis is used to test the claim?
If the loss of weight of customers at the end of their first month is normally distributed with a mean of 6.7lbs and a standard deviation of 0.81lbs
At the 5% significance level, if the sample proportion is .45, and the standard error of the sample proportion is .035, the appropriate conclusion would be:
CPI and Subway Fare Find the best predicted cost of subway fare when the consumer Price Index (CPI) is 182.5 (in the year 2000).
The data in the scatterplot below are an individual's weight and the time it takes (in seconds) on a treadmill to raise his or her pulse rate to 140 beats per minute. The o's correspond to females and the +'s to males.
Construct a 95% confidence interval for the average amount its credit card customers spent on their first visit to the chain's new store in the mall assuming that the amount spent follows a normal distribution.
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