1. Identify the Appropriate Statistical Test Research has shown that losing even one night’s sleep can have a significant effect on performance on complex tasks such as problem solving. To demonstrate this phenomenon, a sample of 25 college students was given a problem solving task at noon on one day and again at noon the following day. The students were not permitted any sleep between the two tests

2. Identify the Appropriate Statistical Test People are selected to serve on juries by randomly picking names from the list of registered voters. The average age for registered voters in the country is 39.7 years with a standard deviation of 12.4. A statistician randomly selects a sample of 16 people who are currently servicing on juries. The average age for the individuals in the sample is 48.9 years

3. Identify the Appropriate Statistical Test Researchers examined the effects of preschool childcare on the development of young children. The average rating of behavioral problems for kindergarten children in the population is 35. A sample of 16 children who had spend at least 20 hours per week in childcare during the previous year produced a mean of 42.7 with a standard deviation of 6. Do children with a history of child care show significantly more behavioral problems than the average kindergarten child?

4. Identify the Appropriate Statistical Test A researcher would like to examine the effects of humidity on eating behavior. It is known that laboratory rats normally et an average of 21 grams of food each day. The researcher selects a random sample of 16 rats and places them in a controlled atmosphere room in which the relative humidity is maintained at 90%. The food consumption for the rats was recorded.

5. Identify the Appropriate Statistical Test A developmental psychologist would like to examine the difference in verbal skills for 6 year old girls compared to 6 year old boys. A sample of 10 girls and 10 boys is obtained, and each child is given a standardized verbal abilities test.

6. Identify the Appropriate Statistical Test Do you view a chocolate bar as delicious or as fattening? Your attitude may depend on your gender. Researchers examined the importance of food as a source of pleasure versus concerns about food associated with weight gain and health. One hundred males and females were recruited for this study and their scores on a measure of concern about the negative aspects of eating was recorded.