In: Statistics and Probability
1.Weights, in pounds, of ten-year-old girls are collected from a
neighborhood. A sample of 26 is given below. Assuming normality,
use Excel to find the 98% confidence interval for the population
mean weight μ. Round your answers to three decimal places and use
increasing order.Weight
66.4
86.3
71.3
52.8
68.0
85.0
66.2
79.2
93.5
84.5
71.1
74.5
65.0
58.5
59.8
80.2
69.2
92.9
78.9
59.4
63.6
66.5
60.7
80.1
60.4
74.5
2.
Julia wants to estimate the percentage of people who submit their tax returns online. She surveys 330 individuals and finds that 65 submit their tax returns online.
Find the margin of error for the confidence interval for the population proportion with a 95% confidence level.
z0.10 | z0.05 | z0.025 | z0.01 | z0.005 |
1.282 | 1.645 | 1.960 | 2.326 | 2.576 |
Use the table of common z-scores above.