Question

In: Statistics and Probability

1.Weights, in pounds, of ten-year-old girls are collected from a neighborhood. A sample of 26 is...

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.

  • Round the final answer to three decimal places

Solutions

Expert Solution


Related Solutions

Suppose the following weights, in pounds, of 28 one-year-old Labradors are collected:
Suppose the following weights, in pounds, of 28 one-year-old Labradors are collected: 65.4 70.2 60.5 53.2 72.4 62.8 66.9 65.7 58.7 80.3 70.5 72.0 68.4 92.5 60.8 69.8 72. 7 68.5 78.9 82. 7 56.3 67.2 62.6 48.5 80.4 88.0 78.5 76.0 1. To the nearest thousandth, determine the mean of this sample, and to the nearest hundred-thousandth, determine the deviation 2. Determine and properly label the five-number summary of the data, and use it to find the IQR 3....
The mean weight of 1-year-old girls is 80 pounds, and the standard deviation is 6 pounds....
The mean weight of 1-year-old girls is 80 pounds, and the standard deviation is 6 pounds. If a sample of 31 girls is selected, what is the probability that their sample mean is between 76.5 and 81.5 pounds? Use your graphing calculator to determine this probability. Enter this answer as a number rounded to four digits after the decimal point.
Baby weight: Following are weights, in pounds, of 10 two-month-old baby girls. It is reasonable to...
Baby weight: Following are weights, in pounds, of 10 two-month-old baby girls. It is reasonable to assume that the population is approximately normal. 12.66 8.63 11.87 14.13 12.32 9.34 10.30 12.34 12.23 11.48 Construct a 90% interval for the mean weight of two-month-old baby girls. Round the answers to three decimal places. ____< u <_____
Researchers aim to study the weights of 10-year-old girls living in the United States (possibly to...
Researchers aim to study the weights of 10-year-old girls living in the United States (possibly to compare to other countries and thus compare growth rates). Based on previous studies, we can assume that weights of 10-year-old girls are Normal. From a small sample of 16 girls, the researchers find a sample average of ?̅ = 91.4 pounds and a sample standard deviation of ? = 2.8 pounds. Create a 99% confidence interval for the true average weight of 10-year-old girls...
1.Weights of Old English Sheepdogs are normally distributed with a mean of 63 pounds and a...
1.Weights of Old English Sheepdogs are normally distributed with a mean of 63 pounds and a standard deviation of 3 pounds. Using the Empirical Rule, what is the approximate percentage of sheepdogs weighing between 60 and 66 pounds? 2.Pro golf scores are bell-shaped with a mean of 70 strokes and a standard deviation of 4 strokes. Using the empirical rule, in what interval about the mean would you expect to find 99.7% of the scores? 3. Running times in a...
The weights of 2-year old children follow a normal distribution with an average weight of 26...
The weights of 2-year old children follow a normal distribution with an average weight of 26 lbs and a standard deviation of 1.5 lbs. You select a random sample of 100 2-year old children. What is the shape of the sampling distribution for the average of 100 2-year olds? What is the mean of the sampling distribution for the average of 100 2-year olds? What is the standard deviation of the sampling distribution for the average of 100 2-year olds?...
Listed in the accompanying data table are birth weights​ (g) from a sample of 26 births....
Listed in the accompanying data table are birth weights​ (g) from a sample of 26 births. When applying the Wilcoxon​ rank-sum test, what is the sum of the ranks for the sample of birth weights of​ girls? Girl 3700 1000 2200 4300 3100 1900 2700 3400 2900 2500 4000 3400 2700 3200 Boy 3600 2700 3700 4200 3600 1800 3400 3800 2700 3300 3400 300 The sum of the ranks for the sample of birth weights of girls is? .
Analyze the following situations: 1. A 26-year-old 5-foot woman who weighs 360 pounds was involved in...
Analyze the following situations: 1. A 26-year-old 5-foot woman who weighs 360 pounds was involved in a motor vehicle accident, sustaining multiple fractures. She is stable and is scheduled for surgery immediately. In this situation, what will be some of the considerations for the OR team on arrival of the patient to the OR suite? 2. A 46-year-old man presents to the OR. He is scheduled for a wound debridement of a right calcaneous foot ulceration. His glucose level is...
The distribution of weights for 12 month old baby girls in the US is approximately normal...
The distribution of weights for 12 month old baby girls in the US is approximately normal with mean of 21 and standard deviation of 2.2 pounds. a. If a 12 month old baby girl weights 23.2 pounds, approximately what weight percentile is she in? b. If a 12 month old baby girl is in the 16th percentile in weight, estimate her weight. c. Estimate the weight of a 12 month old girl who is in the 25th percentile by weight?...
The distribution of weights for 12 month old baby girls in the US is approximately normal...
The distribution of weights for 12 month old baby girls in the US is approximately normal with mean u = 21 pounds and standard deviation of 2.2 pounds. a) if a 12 month old girl weighs 23.2 pounds, approximately what weight percentile is she in? b) if a 12 month old girl is in the 16th percentile in weight, estimate her weight. c) Estimate the weight of t 12 month old girl who is in the 25th percentile by weight....
ADVERTISEMENT
ADVERTISEMENT
ADVERTISEMENT