20. A researcher compared test scores between two school districts A sample in district A gave...
21. The daily milk production of a new breed of cows has a standard deviation of 5 gallons. Researchers plan to sample 100 cows in order to estimate the mean amount. What is the probability that the sampling error will not exceed 0.6 gallon? (a) 0.0956 (b) 0.2743 (c) 0.5478 (d) 0.7699 (e) 0.8845
Here are the IQ test scores of 31 seventh-grade girls in a Midwest school district: 114 100 104 89 102 91 114 114 103 105 108 130 120 132 111 128 118 119 86 72 111 103 74 112 107 103 98 96 112 112 93 These 31 girls are an SRS of all seventh-grade girls in the school district. Suppose that the standard deviation of IQ scores in this population is known to be σ σ = 15. We...
Here are the IQ test scores of 31 seventh-grade girls in a Midwest school district: 114 100 104 89 102 91 114 114 103 105 108 130 120 132 111 128 118 119 86 72 111 103 74 112 107 103 98 96 112 112 93 These 31 girls are an SRS of all seventh-grade girls in the school district. Suppose that the standard deviation of IQ scores in this population is known to be σ = 15. We expect...