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To test whether there is any association between two variables using Chi-Square test for independence.
Can people really identify their favorite brand of cola? Volunteers tasted Coca-Cola Classic, Pepsi, Diet Coke, and Diet Pepsi, with the results shown below. Research question: At α = .05, is the correctness of the prediction different for the two types of cola drinkers? Could you identify your favorite brand in this kind of test? Since it is a 2 × 2 table, try also a two-tailed two-sample z test for π1 = π2 (see Chapter 10) and verify that z2 is the same as your chi-square statistic. Which test do you prefer? Why?
Correct?
Regular Cola
Diet Cola
Row Total
Yes, got it right
7
14
No, got it wrong
12
20
32
Col Total
19
27
46
If level of significance ( α ) is 0.005 in two-tail test, how large is non rejection region under curve of the t distribution?
Assume that the smiling time of eight-week old babies, in seconds, follows a uniform distribution between 0 and 23 seconds, inclusive. This means that any smiling time from 0 to and including 23 seconds is equally likely.
The null hypothesis is that there was no change in average liquor consumption. State this formally in terms of µ.
What is the probability that a cereal would either high calorie or high fiber? In other words, what is P(high calorie or high fiber)?
Determine whether or not the mean waiting time of all customers is significantly more than 3 minutes.
Interpret this data using regression and interpret all the findings, R 2 , F, IV coefficient, and the intercept.
At the .01 significance level, is there a difference in the use of the four entrances?
Suppose the sample variance for 30 parts turns out to be s 2 = .0005. Use α = .05 to test whether the population variance specification is being violated.
To determine whether there exists mean difference among the groups:
A savings account was opened for a baby on 1985 with a $100 deposit. No withdrawals or deposits occurred since the account was opened. The current balance of the account is $246.47. Measured in dollars of the year in which the account was opened, how..
Would the null hypothesis be accepted or rejected in this case?
If 1 man aged 18-24 is arbitrarily chosen, determine the probability that his serum cholesterol level is between 165 and 200.
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