# Qnt/561 qnt 561 qnt561 week 4 individual assignment – practice quiz –

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1. Researchers conducted a survey of a representative sampler of over 1,000 drivers. Based on how often each driver engaged in a road rage behaviour, a road rage score was given
2. Researchers surveyed a random sample of 25 employees who were enrolled in a certain program at one of the three universities. These individuals were divided into four distinct groups, 1, 2, 3, and 4 depending on their job situation at a previous or current firm.
3. What condition must n satisfy to make the X2 test valid
4. There has been a recent trend for sports franchises in baseball, football, basketball and hockey to build new stadiums and ballparks in urban, downtown venues. A magazine investigated
5. Each child in a sample of 62 low-income children was  administered a language and communication exam. The sentence complexity scores had a mean of 7.63 and standard deviation of 8.94  Complete parts   a through d
6. Which hypothesis, the null or the alternative, is the status-quo hypothesis
7. Suppose the mean GPA of all students graduating  from the university of Iowa in 1975 was 2.80. the registrar plans to look at records of students graduating in 2005 to see if mean GPA has changes. define notation and state the null and alternative hypotheses for this investigation
8. A random sample of 100 observations from  a population with standard deviation 55 yielded a sample mean of 110  Complete parts a through c
9. For the and observed significance level(p-value) pair, indicate whether the null hypothesis will be rejected
10. A study analyses recent incidents involving terrorists attacks. Data on the number of individual suicide bombings that occurred in each of 20 sampled terrorists group attacks
11. When planning for a new forest road for tree harvesting, planners must select the location to minimize a tractor skidding distance
12. Suppose a consumer group rated  42 brands of toothpaste based on whether or not the brand carries an American Dental Association seal verifying effective decay prevention
13. To use the t-statistic to test for a difference between the means of two populations, what assumptions must me made about the two populations?  About the two samples?
14. A study was done to examine whether the perception of service quality at hotels differed by gender. Hotels were randomly selected to rate service items on a 5-point scale. The sum of the guest scores are provided in the table. Complete parts a and b.
15. To determine if winning a certain award leads to a change in life expectancy, researchers sampled 742 award winners and matched each one with another person
16. School bullying is a form of aggressive behavior that occurs when a student is exposed repeatedly to negative actions from another student. In order to study the effectiveness of an antibullying policy at elementary schools

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