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1.) How do i obtain vitamin D blood levels on the entire US population of landscape gardeners. The population average level of vitamin D in US landscapers was found to be 53.67 ng/mL with a standard deviation of 5.167 ng/mL. Assuming the true distribution of blood vitamin D levels follows a Gaussian distribution, if you randomly select a landscaper in the US, what is the probability that his/her vitamin D level will be between 45.56 and 60.24 ng/mL?Please show steps as i need to check to see if my answer is correct.
2.) The population average level of vitamin D in US landscapers was found to be 54.25 ng/mL with a standard deviation of 5.211 ng/mL. Assuming the true distribution of blood vitamin D levels follows a normal distribution, if you randomly select a landscaper in the US, what is the likelihood that his/her vitamin D level will be 62.16 ng/mL or less? Please show steps as i need to check to see if my answer is correct.
3.) The population average level of vitamin D in US landscapers was found to be 32.87 ng/mL with a standard deviation of 4.529 ng/mL. Assuming the true distribution of blood vitamin D levels follows a Gaussian distribution, what is the lower value of the region for which approximately 68% of the data are located within the distribution? Please show steps as i need to check to see if my answer is correct.
4.) The population average level of vitamin D in US landscapers was found to be 43.94 ng/mL with a standard deviation of 4.63 ng/mL. Assuming the true distribution of blood vitamin D levels follows a Gaussian distribution, if you randomly select a landscaper in the US, what is the likelihood that his/her vitamin D level will be 33.77 ng/mL or less?Please show steps as i need to check to see if my answer is correct.
Jan is a 35-year-old individual who plans to retire at age 65. Between now and then $4000 is paid annually into her IRA account
Sexual harassment at middle and high schools. A nationally representative survey of students in grades 7 to 12 asked about the experience of these students.
the standard deviation of a distribution is 20. if a sample of 225 is selected what is the standard error of the
Many shoppers have expressed unhappiness because grocery stores have stopped putting prices on individual grocery items. The article "The Impact of Item Price Removal on Grocery Shopping Behavior" (J. of Marketing, 1980: 73-93) reports on a study ..
to evaluate a particular metlar scale an item whose weight is known to be 16.01 ounces is weighted five times by the
Statistics are sometimes misinterpreted.One common way is when relationships that exist at a group level are assumed to hold at the individual level.
find the critical value. assume that the test is two-tailed and that n denotes the number of pairs of data. n 7 a
Suppose that a random variable X has a continuous distribution with the p. d. f. given in Example 2 of this section. Find the expectation of 1/ X.
if i build a regression model with two independent variables that are highly correlated which violation of the
Explain why the ordinary least squares solution is not unique. What can you say about the residuals of any of the solutions. Using the SVD of X, write a closed form expression for this limiting solution.
the correlation between the number of police on the street and the number of crimes committed for a sample of 15
If 16 out of 20 spins just came up black, determine the probability that next spin is going to be red?
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