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Test whether there is significant difference between the frequency distributions for male and female.
Research results suggest that IQ scores for boys are more variable then IQ scores for girls. A typical study looking at 10-year-old children classifies participants by gender and by low, average, or high IQ. Following are hypothetical data representing the research results. Do the data indicate a significant difference between the frequency distributions for male and females? Test at the .05 level of significance and describe the difference.
IQ
Low
Average
High
Boys
18
42
20
80
Girls
12
54
14
n = 160
For thefts involving more than $1,000, there is an inverse relationship between the value of the goods stolen and the length of the prison sentence given to the thief.
Shall we reject the hypothesis that the population mean is 6.0? Interpret the result.
Key Refining decided to send a special financing plan to charge account customers having the highest 10 percent of the money charges. What is the dividing point between customers who receive the special plan and those who do not.
A frequency polygon: does not depend on one variable. True-False
A population whose shape is unknown has a median of 75. You selected a sample of 40. The standard deviation of the median is 5. Calculate the probability that the median of the sample or average medians is:
Which measure of association do you use to compare the relationship between these variables? Why?
This is called a one-time fling. About 10% of all adults deliberately do a opne-time fling and feel no guilt about it!
The participants in a television quiz show are picked from a large pool of applicants with approximately equal numbers of men and women.
Find a 90% confidence interval for the population average µ of the percentage of hospitals providing at least some charity care.
The standard deviation of the sample is $3,000. Interpret your findings.
Find the critical value z that corresponds to the given confidence level of 90%.
Dinner B which costs $135.30 for dinner submitted by salesperson with mean cost of $117.50 and standard deviation of $30 per dinner?
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