Question 17
Hemoglobin levels in 11-year-old boys vary according to a Normal distribution with σ = 1.2 g/dl.
How large a sample is needed to estimate mean μ with 95% confidence so the margin of error is no greater than 0.5 g/dl?
A. |
32 |
|
B. |
23 |
|
C. |
21.3 |
|
D. |
25 |
Question 17 Hemoglobin levels in 11-year-old boys vary according to a Normal distribution with σ =...
Hemoglobin levels in 11-year old boys have a Normal distribution with unknown mean μ and s = 1.209g/dl. How large a sample is needed to estimate μ with 95% confidence and a margin of error of 0.5?
We’ve established that heights of 10-year-old boys vary according to a Normal distribution with μ = 140 cm and σ = 5 cm. What proportion is between 150 and 140 cm? a. 68% b. 50% c. 97.72% d. 47.72%
7.5 we've established that heights of 10-year-old boys vary according to a Normal distribution with u = 138 cm and o = 7 cm a) What proportion of this population is less than 150 cm tall? b) What proportion is less than 140 cm in height? c) What proportion is between 150 and 140 cm?
The heights of 16-year old girls vary according to a normal distribution with a population mean of 158 centimeters (cm) and a population standard deviation of 24 cm. With this information, we can determine that the probability a randomly selected 16-year old girl drawn from the population measures between 150 cm and 160 cm is approximately 0.16. True or False?
17. According to the Central Limit Theorem, a distribution of sample means based on a sample of n= 7 will approximate normality even if the data in the parent population are not normal. 18. When performing hypothesis tests or computing confidence intervals based on large samples, it is necessary to assume that the data in the parent population(s) are distributed normally. 19. To estimate u within two units with 95% confidence and o= 10 requires n be at least 100.
Researchers were interested in estimating the mean body mass index (BMI) for 5 year old girls in a very large school district in Oklahoma. A random sample of size 61 five year old girls was drawn, and the sample mean BMI was found to be 17.4. Although BMI measurements are typically a little right-skewed, because of the reasonably large sample size, the researchers felt it was reasonable to use procedures based on the normal distribution. Based on previous information, they...
Researchers were interested in estimating the mean body mass index (BMI) for 5 year old girls in a very large school district in Oklahoma. A random sample of size 70 five year old girls was drawn, and the sample mean BMI was found to be 17.4. Although BMI measurements are typically a little right-skewed, because of the reasonably large sample size, the researchers felt it was reasonable to use procedures based on the normal distribution. Based on previous information, they...
Answer the questions according to given case study- Adam is a 68-year-old male admitted to the hospital with a 1-month history of nausea, vomiting, and diarrhea resulting in weight loss and fatigue. He presents tachycardic with abdominal pain, fever, and chills. Adam is a retired engineer and lives at home with his wife. Anthropometric Data: Height: 165 cm (65”) Weight: 75 kg (165 lbs) BMI: 27.5 kg/m2 Weight History Usual body weight: 82 kg (180 lbs) 1 year ago Biochemical...
problems 4, 5, 6, 11 and 13 If the population standard deviation was doubled to 10.4 and the level of confidence remained at 90%, what would be the new margin of error and confidence interval Margin of error, E. Confidence interval: 20.11<x<34.31 O Did the confidence interval increase or decrease and why? increase 4. Definition of Confidence Intervals (Section 6.1) Circle your answer, True of False. • A 99% confidence interval means that there is a 99% probability that the...
11. Do one of the following, as appropriate: (a) Find the critical value z a, (b) find the critical value (ipoint tap, (c) state that neither the normal nor the t distribution applies. 99%; n = 17, σ is unknown; population appears to be normally distributed. O zan 2.583 O tan a/2 -2.898 O ta/2-2921 O za/2#2567 12. Do one of the following, as appropriate: (a) Find the critical value za/2, (b) find the critical value (point) tan,(c) state that...