You want to estimate the average price of a home in your city. You know that the standard deviation in prices is $80,000. You take a simple random sample of 40 homes and compute a sample mean of $288,000. 1. Find a 95% confidence interval for the population mean. 2. How many homes would you need to sample to get a margin of error of less than $8000.

What is the volume of this pyramid? 945 cm³ 1260 cm³ 1890 cm³ 2520 cm³

Which set of measurements could be the side lengths of a triangle? a- 2 cm, 8 cm, 12 cm b- 13 cm, 7 cm, 4 cm c- 9 cm, 4 cm, 4 cm d- 7 cm, 10 cm, 8 cm

Adevelopmental psychologist has prepared a training program that according to a psychological theory should improve problem solving ability. for the population of six-year olds, the average score on a standardized problem-solving test is known to be μ = 80 with σ = 10. to test the effectiveness of the training program, a random sample of 18 six-year-old children were selected. after training, the average score for this sample is m = 84.44. the experimenter used an alpha level of .05.perform the hypothesis test for this experiment.