explain properly

For each of the following research examples identify which statistical test should be used (2 pts each). 6. A research knows the population mean but not the population standard deviation for children's IQ scores. She selects a sample of children that have been enrolled in a Head Start programs and wants to know if they have higher IQ scores than would be expected by chance from a sample drawn from the entire population. 7. A researcher randomly assigns participants to receive an antidepressant drug or placebo and then obtains depression scores on the Beck Depression Inventory. He suspects that participants who received the drug will have lower mean depression scores than those that received the placebo, 8. A researcher wants to know if SAT scores are predictive of college GPA. Show Transcribed Text 9, A researcher wants to know if there is a gender bias in university promotion system, She compares the frequency of female professors who are tenured or not tenured to the frequency of male professors who are tenured or not tenured. 10. A researcher wants to examine the effect of testing on memory. Participants read a brief passage. They are then randomly assigned to one of three treatment conditions, Participants in the first condition do not see the material again until they are test I week later. Participants in group two study the material for 30 minutes and are then tested a week later. Participants in group three take a test immediately after reading the material and take another test I week later. The research wants to know if the three groups differ in their performance on the final test.For each of the following research examples identify which statistical test should be used (2 pts each). 6. A research knows the population mean but not the population standard deviation for children's IQ scores. She selects a sample of children that have been enrolled in a Head Start programs and wants to know if they have higher IQ scores than would be expected by chance from a sample drawn from the entire population. 7. A researcher randomly assigns participants to receive an antidepressant drug or placebo and then obtains depression scores on the Beck Depression Inventory. He suspects that participants who received the drug will have lower mean depression scores than those that received the placebo, 8. A researcher wants to know if SAT scores are predictive of college GPA. Show Transcribed Text 9, A researcher wants to know if there is a gender bias in university promotion system, She compares the frequency of female professors who are tenured or not tenured to the frequency of male professors who are tenured or not tenured. 10. A researcher wants to examine the effect of testing on memory. Participants read a brief passage. They are then randomly assigned to one of three treatment conditions, Participants in the first condition do not see the material again until they are test I week later. Participants in group two study the material for 30 minutes and are then tested a week later. Participants in group three take a test immediately after reading the material and take another test I week later. The research wants to know if the three groups differ in their performance on the final test