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Consider the following contingency table:
Under 20
21-30
31-40
Total
Male
12
17
41
Female
13
16
21
50
25
28
38
91
A. If one person is selected at random, what is the probability that person is Female?
B. If one person is selected at random, what is the probability that person is either under 20 or over 30?
C. If one person is selected at random, what is the probability that person is either male or in the age group 21-30?
D. If two people are selected at random, what is the probability they are both female?
Compute a 95% confidence interval for the mean using the formula and where is the mean of the ten random numbers.
each person received was determined by randomization. For each person who was sent one of the surveys, the researcher recorded whether or not a completed survey was returned.
Let p represent the proportion of registered voters in the state that would vote for the Republican candidate. The standard error for the proportion of those who phoned in who answered "yes" is
Which of the following assumptions for inference about a proportion using a confidence interval are violated,
The Kruskal-Wallis rank test is a nonparametric replacement - The Wilcoxon rank sum test tests a null hypothesis
Which of the following would produce a new confidence interval with smaller width based on these same data and produce a new confidence interval
The standard deviation of grade points was 0.65 and the mean was 2.89. The standard error for the sample was
The number of customers at a specialty meat store averages about 1500/day. The exact number varies from day to day. On Fridays before long weekends, the number of customers increases to about 3000. Which of the following statements is correct
P-value to test hypotheses,
A random variable has the density curve as in the graph below. Find The height of the density curve?
Survey on What do you think is the biggest problem facing education today. One problem with exit polls may be that the wrong "key precincts" were chosen.
Compute the variance and standard deviation
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