These data show the number of words found in a simple random sample of 32 paragraphs written by high school seniors.
51 36 48 68 72 55 46 49
38 42 41 50 64 70 30 38
42 39 55 54 44 58 61 84
63 34 36 57 51 45 41 60
1. use technology to find the mean and standard deviation of the sample.
2. construct a 90% confidence interval for the mean number of words in paragraphs written by all high school seniors. use a complete sentence to describe the confidence interval.