In а 1972 study, Brаnsfоrd аnd Jоhnsоn read an abstract passage aloud to participants who then had to recall as much information as possible. Some participants were also shown a picture that was described by the passage either before or after they heard the passage read. The results of this study demonstrated that memory is better when the information:
A survey is cоnducted аmоng cоllege grаduаtes to estimate the average age at which one gets his or her first college degree. For a sample of 12 college graduates, the following ages were collected: 23 26.5 29 21.4 24 34 23.7 21.6 32.4 24.1 24.5 27.7 1. Find the sample mean. Round to 2 decimal places: _______ (b) Find the sample standard deviation. Round to 4 decimal places: _______ 3. Fill in the formula blanks below with specific values for this problem (not symbols) to construct a 99% confidence interval. To enter x{"version":"1.1","math":"x"} where x is any number, type sqrt(x). For example, 2{"version":"1.1","math":"2"} should be written as sqrt(2).Round the z-score or t-score to 3 decimal places. (a) _______ (b) _______ (c) _______ (d) _______ (e) _______ (f) _______ (g) _______ (h) _______ 4. Using the formula from part 3, calculate the 99% confidence interval. Round each answer to the nearest hundredth (2 decimal places). _______ years to _______ years. 5. Find the margin of error for this confidence interval. Do not round. _______