Amongst pregnant women, BMI at 16 weeks gestation has a mean of 28.5 with a standard...
Amongst pregnant women, BMI at 16 weeks gestation has a mean of 28.5 with a standard deviation of 3.6. A) If a sample of 55 pregnant women is selected, which of the following is the probablity that their mean BMI will be less than 30? B) If a sample of 50 pregnant women is selected, indicate the probability that their mean BMI will be more than 30. Thank you.
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Amongst pregnant women, BMI at 16 weeks gestation has a mean of
28.5 with a standard...
Amongst pregnant women, BMI at 16 weeks gestation has a mean of 28.5 with a standard...
Amongst pregnant women, BMI at 16 weeks gestation has a mean of 28.5 with a standard deviation of 3.6. To solve the problems below, assume that BMI follows a normal distribution. Indicate the proportion of pregnant women that have a BMI less than 24.9. (1pt) a) P (X < 24.9) = 0.16 b) P (X < 24.9) = 0.34 c) P (X < 24.9) = 0.68 d) P (X < 24.9) = 0.84 e) Some other answer; indicate: Indicate the...
Suppose a team of researchers has collected BMI data from a population of pregnant women. Although...
Suppose a team of researchers has collected BMI data from a population of pregnant women. Although the mean BMI of that population is unknown, the standard deviation is known and equal to 13. If a simple random sample of 150 women is selected from the population, which of the following is the probability that the sample mean is no more than 1.5 units away from the population mean?
11. Gestation Period The length of human pregnancies is approximately normally distributed with mean u =...
11. Gestation Period The length of human pregnancies is approximately normally distributed with mean u = 266 days and standard deviation o = 16 days, (a) What is the probability a randomly selected preg- nancy lasts less than 260 days? (b) What is the probability that a random sample of 20 pregnancies have a mean gestation period of 260 days or less? (c) What is the probability that a random sample of 50 pregnancies have a mean gestation period of...
ome he proportion of adult women in the United States is approximately 51%. A marketing survey...
ome he proportion of adult women in the United States is approximately 51%. A marketing survey telephones 300 people at random. (a) (3pts) What is the sampling distribution of the observed proportion that are women? State your answer with the mean and the standard deviation. 30 o (b) (3pts) would you be surprised to find 56% women in a sample of size 300? Explain. (c) (2 pts) What is the probability that more than S0% women in this survey? (d)...
The mean height of women in a country (ages 20-29) is 63.5 inches. A random sample...
The mean height of women in a country (ages 20-29) is 63.5 inches. A random sample of 50 women in this age group is selected. What is the probability that the mean height for the sample is greater than 64 inches? Assume o = 2.85. The probability that the mean height for the sample is greater than 64 inches is (Round to four decimal places as needed.) The height of women ages 20-29 is normally distributed, with a mean of...
Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight...
Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 2500 grams and a standard deviation of 700 grams while babies born after a gestation period of 40 weeks have a mean weight of 3000 grams and a standard deviation of 480 grams. If a 33-week gestation period baby weighs 2650 grams and a 41-week gestation period baby weighs 3150 grams, find the corresponding z-scores. Which baby weighs more relative to the gestation...
Babies born after a gestation period of 32-35 weeks have a mean weight of 2600 grams...
Babies born after a gestation period of 32-35 weeks have a mean weight of 2600 grams and a standard deviation of 660 grams. Babies born after a gestation period of 40 weeks have a mean weight of 3500 grams and a standard deviation of 470 grams. Suppose a 34-week gestation period baby weights 3000 grams and a 40-week gestation period baby weights 3900 grams. What is the z-score for the 34-week gestation period baby? What is the z-score for the...
Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight...
Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 2500 grams and a standard deviation of 700 grams while babies born after a gestation period of 40 weeks have a mean weight of 3100 grams and a standard deviation of 475 grams. If a 32-week gestation period baby weighs 2775 grams and a 41-week gestation period baby weighs 3375 grams, find the corresponding z scores. Which baby weighs more relative to the...
A leading magazine (like Barron's) reported at one time that the average number of weeks an...
A leading magazine (like Barron's) reported at one time that the average number of weeks an individual is unemployed is 17 weeks. Assume that for the population of all unemployed individuals the population mean length of unemployment is 17 weeks and that the population standard deviation is 7 weeks. Suppose you would like to select a random sample of 30 unemployed individuals for a follow-up study. Find the probability that a single randomly selected value is less than 16 P(X...
5. (30 points) A group of researchers conducted a study of pregnant cocaine-dependent women. All of...
5. (30 points) A group of researchers conducted a study of pregnant cocaine-dependent women. All of the women in the study used cocaine on a regular basis (at least three times a week) for more than a year. One of the many variables measured was birth-weight (in grams) of the baby delivered. Suppose a random sample of 36 cocaine-dependent women had a mean birth-weight of 2,981 grams with a standard deviation of 420 grams. Test using a 5% significance level...
11. Gestation Period The length of human pregnancies is approximately normally distributed with mean u = 266 days and standard deviation o = 16 days, (a) What is the probability a randomly selected preg- nancy lasts less than 260 days? (b) What is the probability that a random sample of 20 pregnancies have a mean gestation period of 260 days or less? (c) What is the probability that a random sample of 50 pregnancies have a mean gestation period of...
ome he proportion of adult women in the United States is approximately 51%. A marketing survey telephones 300 people at random. (a) (3pts) What is the sampling distribution of the observed proportion that are women? State your answer with the mean and the standard deviation. 30 o (b) (3pts) would you be surprised to find 56% women in a sample of size 300? Explain. (c) (2 pts) What is the probability that more than S0% women in this survey? (d)...
The mean height of women in a country (ages 20-29) is 63.5 inches. A random sample of 50 women in this age group is selected. What is the probability that the mean height for the sample is greater than 64 inches? Assume o = 2.85. The probability that the mean height for the sample is greater than 64 inches is (Round to four decimal places as needed.) The height of women ages 20-29 is normally distributed, with a mean of...
Suppose babies born after a gestation period of 32 to 35 weeks have a mean weight of 2500 grams and a standard deviation of 700 grams while babies born after a gestation period of 40 weeks have a mean weight of 3100 grams and a standard deviation of 475 grams. If a 32-week gestation period baby weighs 2775 grams and a 41-week gestation period baby weighs 3375 grams, find the corresponding z scores. Which baby weighs more relative to the...
A leading magazine (like Barron's) reported at one time that the average number of weeks an individual is unemployed is 17 weeks. Assume that for the population of all unemployed individuals the population mean length of unemployment is 17 weeks and that the population standard deviation is 7 weeks. Suppose you would like to select a random sample of 30 unemployed individuals for a follow-up study. Find the probability that a single randomly selected value is less than 16 P(X...
5. (30 points) A group of researchers conducted a study of pregnant cocaine-dependent women. All of the women in the study used cocaine on a regular basis (at least three times a week) for more than a year. One of the many variables measured was birth-weight (in grams) of the baby delivered. Suppose a random sample of 36 cocaine-dependent women had a mean birth-weight of 2,981 grams with a standard deviation of 420 grams. Test using a 5% significance level...
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