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Q1) National Student Loan Survey gathers data to study questions related to amount of money that borrowers owe. Survey selected a sample of 1280 borrowers who began repayment on their loans between 4 and 6 months prior to survey. Mean debt for undergraduate study was $18,900 and standard deviation was about $49,000. Create a 95% confidence interval for true mean debt for student borrowers.
Following six students were questioned regarding (X) their attitudes toward legalization of prostitution and (Y) their attitudes toward legalization of marijuana.
a) Calculate and interpret Pearson's correlation coefficients for these data whether correlation is significant at alpha level .05 (using all your steps for hypothesis testing).
b) Calculate and interpret the constant (a) and slope (b) for these data and test whether this relationship is important at alpha level .05 (go through all of your steps of hypothesis testing). Standard error of b is .084.
x
y
A
1
2
B
6
5
C
4
3
D
E
F
7
Would Kruskal-Wallis be the suitable statistical procedure to test this Research Question (RQ)? Describe your answer. When would you use Chi-Square test rather than One-Way Anova?
This distribution is positively skewed. The standard deviation of the population is not known.
Determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.
A study of cardiovascular risk factors compared heavy smokers, light smokers, and nonsmokers. Both men and women were included in the study so that the two factors are smoking level and gender.
What kind of probability uses sample spaces to find out numerical probability that event will happen?
The means appear to be very close, but not the variances. At α = .05, is there a difference in variances? Show all steps clearly, including an illustration of the decision rule.
The population of IQ scores forms a normal distribution with mean of μ = 100 and a standard deviation of σ = 15. What is the probability of obtaining a sample mean greater than M = 105,
The standard deviation of the differences d for the paired sample data s d = ____________
At 0.05 level of significance, is there evidence of significant relationship between age group and where people mainly get their news? If so, describe the relationship.
An old saying in golf is "you drive for show and you putt for dough." The point is that good putting is more important than long driving for shooting low scores and hence winning money.
Do students tend to improve their SAT Mathematics (SAT-M) score the second time they take the test? A random sample of four students who took the test twice received the following scores
To test whether the population standard deviation differ significantly using Chi-Square test.
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