identify a 99% confidence interval for the mean score of all dallas eighth graders (be careful the report gives the standard error not the standard deviation
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(b) Give a 99% confidence interval for the mean score of all Dallas eighth-graders. (Be careful: the report gives the standard error of x̄, not the standard deviation s.) (c) Urban children often perform below the basic level. Is there good evidence that the mean for all Dallas eighth-graders is more than the basic level?
Sri K.
The Trial Urban District Assessment (TUDA) is a government-sponsored study of student achievement in large urban school districts. TUDA gives a mathematics test scored from 0 to 500. A score of 262 is a "basic" mathematics level and a score of 299 is "proficient". Scores for a random sample of 1100 eight-graders in Dallas had x̄= 271 with standard error 1.3. a) Construct a 99% confidence interval for the mean score of all Dallas eight-graders. (Be careful: the report gives the standard error of x̄, not the standard deviation s.) b) Urban children often perform below the basic level. Is there good evidence that the mean for all Dallas eight-graders is more than the basic level?
Supreeta N.
The following data represent the scores of a sample of 45 randomly chosen students on a standardized test. 39 48 55 63 66 68 68 69 70 71 71 73 74 76 76 76 77 78 79 79 79 80 80 82 83 83 83 85 86 86 88 88 88 88 89 89 90 91 92 92 93 95 96 97 97 a. Compute the the mean and standard deviation of the sample. b. Compute the standard error of the sample mean. c. Write a 99% confidence interval for the mean score of all students who took the test. d. Identify the target parameter and the point estimator. e. Interpret the confidence interval.
Jerelyn N.
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