Statistics and Probability

i need quic answers please

does not need explanation

1) If our treatment (the Independent variable) does NOT significantly changes the scores, then the statistical decision will be: _ (provided there is not an error) a. Retain the null hypothesis b. Reject the null hypothesis c. Ignore the null hypothesis d. Address the null hypothesis 2) Which of the following research scenarios uses a one sample t test design? a. Evaluate a memory-enhancing drug by measuring how many words one sample of people can recall after reading the list of words, without receiving the drug compared to a second sample that read the same words, received the drug and later recalled the words. b. Study the taste preference of mice by measuring how much of two different types of food were eaten. It would be assumed that if there was no preference between the foods, that the amount eaten would be equal, but we do not have any idea of the standard deviation of food eaten. The amount of food one sample of mice ate is measured after access to both foods. c. Test a training program's effect on IQ scores (population mean and standard deviation known) on a single sample of people who received the training d. Evaluate emotional changes in the elderly at age 75 and then again at age 85 for a single sample. 3) Which of the following research scenarios uses a two samples independent-measures t test? a. Evaluate the effectiveness of a pain reliever by measuring how much pain is reduced after taking the medication in a single group of people b. Examine the difference in self-esteem between student athletes and non-athletes. c. Evaluate the development of verbal skills between age 2 and age 3 for a sample of girls. d. Test the effectiveness of a cholesterol medication by comparing cholesterol levels before and after the medication is administered