(Normal distribution: Finding a raw score) Calcium levels in people are normally distributed with a mean...
(Normal distribution: Finding a raw score)
Calcium levels in people are normally distributed with a mean of 9.5 mg/dL and a standard deviation of 0.3 mg/dL. Individuals with calcium levels in the bottom 10% of the population are considered to have low calcium levels. Find the calcium level that is the borderline between low calcium levels and those not considered low. Carry your intermediate computations to at least four decimal places. Round your answer to one decimal place.
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(Normal distribution: Finding a raw score)
Calcium levels in people are normally distributed with a mean...
(Normal distribution: Finding a raw score) Suppose that scores on a particular test are normally distributed...
(Normal distribution: Finding a raw score) Suppose that scores on a particular test are normally distributed with a mean of 110 and a standard deviation of 19. What is the minimum score needed to be in the top 10% of the scores on the test? Carry your intermediate computations to at least four decimal places, and round your answer to one decimal place.
(Normal distribution: Finding a raw score) Suppose that the quarterly sales levels among health care information...
(Normal distribution: Finding a raw score) Suppose that the quarterly sales levels among health care information systems companies are approximately normally distributed with a mean of 12 million dollars and a standard deviation of 1.2 million dollars. One health care information systems company considers a quarter a "failure" if its sales level that quarter is in the bottom 20% of all quarterly sales levels. Determine the sales level (in millions of dollars) that is the cutoff between quarters that are...
Assume total cholesterol levels (TChol) are normally distributed with mean μ = 215 mg/dl and standard...
Assume total cholesterol levels (TChol) are normally distributed with mean μ = 215 mg/dl and standard deviation σ = 30 mg/dl for the adult American population. That is, TChol ~ N(215, 302). Total cholesterol values of 240 mg/dl or greater are considered high; and levels in the range of 200 to 240 are called borderline high. a. What proportion of this population do we expect to find with high cholesterol? What proportion do we expect to find with borderline high...
2. Calcium levels in healthy adults are normally distributed with mean 9.5 mg/dl per deciliter and...
2. Calcium levels in healthy adults are normally distributed with mean 9.5 mg/dl per deciliter and known standard devtion. A physician in a rural community suspects that the mean calcium levels are different for women i this comunity. He collects measurements from 20 healthy women and finds = 9.2 with sample standard deviation s 1.1. (a) (1 point) Describe the parameter of interest to the physician (b) (2 points) State the nl and alternative hypotheses (c)(1 point) Suppose we assume...
The cholesterol levels of adult males are approximately normally distributed with a mean of 224 mg/dl,...
The cholesterol levels of adult males are approximately normally distributed with a mean of 224 mg/dl, and a variance, o', of 521. Some researchers claim that the variance of cholesterol levels of adult males is less than 521. A sample of 15 adult males' blood tests had a mean of 222.5 mg/dL and a variance of 192. Is there enough evidence to conclude, at the 0.05 level of significance, that the variance of cholesterol levels of adult males is less...
Suppose that the quarterly sales levels among health care information systems companies are approximately normally distributed...
Suppose that the quarterly sales levels among health care information systems companies are approximately normally distributed with a mean of 9 million dollars and a standard deviation of 1.2 million dollars. One health care information systems company considers a quarter a "failure" if its sales level that quarter is in the bottom 15% of all quarterly sales levels. Determine the sales level (in millions of dollars) that is the cutoff between quarters that are considered "failures" by that company and...
Suppose the distribution of serum cholesterol values in undergraduate men is approximately normally distributed with mean...
Suppose the distribution of serum cholesterol values in undergraduate men is approximately normally distributed with mean mu = 190 mg/dl and standard deviation sigma = 40 mg/dl. a) What is the probability of selecting someone at random from this population who has a cholesterol value that is less than 180? b) You take a simple random sample of n = 49 individuals from this population and calculate the mean cholesterol of the sample. Describe the sampling distribution of x-bar? c)...
Suppose that scores on a particular test are normally distributed with a mean of 130 and...
Suppose that scores on a particular test are normally distributed with a mean of 130 and a standard deviation of 19. What is the minimum score needed to be in the top 20% of the scores on the test? Carry your intermediate computations to at least four decimal places, and round your answer to one decimal place. ?
Suppose that scores on a particular test are normally distributed with a mean of 140 and...
Suppose that scores on a particular test are normally distributed with a mean of 140 and a standard deviation of 16. What is the minimum score needed to be in the top 20% of the scores on the test? Carry your intermediate computations to at least four decimal places, and round your answer to one decimal place.
Suppose that scores on a particular test are normally distributed with a mean of 130 and...
Suppose that scores on a particular test are normally distributed with a mean of 130 and a standard deviation of 20. What is the minimum score needed to be in the top 20% of the scores on the test? Carry your intermediate computations to at least four decimal places, and round your answer to one decimal place. |x 6 ?
2. Calcium levels in healthy adults are normally distributed with mean 9.5 mg/dl per deciliter and known standard devtion. A physician in a rural community suspects that the mean calcium levels are different for women i this comunity. He collects measurements from 20 healthy women and finds = 9.2 with sample standard deviation s 1.1. (a) (1 point) Describe the parameter of interest to the physician (b) (2 points) State the nl and alternative hypotheses (c)(1 point) Suppose we assume...
The cholesterol levels of adult males are approximately normally distributed with a mean of 224 mg/dl, and a variance, o', of 521. Some researchers claim that the variance of cholesterol levels of adult males is less than 521. A sample of 15 adult males' blood tests had a mean of 222.5 mg/dL and a variance of 192. Is there enough evidence to conclude, at the 0.05 level of significance, that the variance of cholesterol levels of adult males is less...
Suppose that the quarterly sales levels among health care information systems companies are approximately normally distributed with a mean of 9 million dollars and a standard deviation of 1.2 million dollars. One health care information systems company considers a quarter a "failure" if its sales level that quarter is in the bottom 15% of all quarterly sales levels. Determine the sales level (in millions of dollars) that is the cutoff between quarters that are considered "failures" by that company and...
Suppose that scores on a particular test are normally distributed with a mean of 130 and a standard deviation of 19. What is the minimum score needed to be in the top 20% of the scores on the test? Carry your intermediate computations to at least four decimal places, and round your answer to one decimal place. ?
Suppose that scores on a particular test are normally distributed with a mean of 130 and a standard deviation of 20. What is the minimum score needed to be in the top 20% of the scores on the test? Carry your intermediate computations to at least four decimal places, and round your answer to one decimal place. |x 6 ?
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