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Breast-feeding versus baby formula. A study of iron deficiency among infants compared samples of infants following different feeding regimens. One group contained breast-fed infants, while the children in another group were fed a standard baby formula without any iron supplements. Here are summary results on blood hemoglobin levels (a measure of iron in the blood) at 12 months of age
Group
n
x‾
s
Breast-fed
23
13.3
1.7
Formula
19
12.4
1.8
(a) Is there significant evidence that the mean hemoglobin level is higher among breast-fed babies? State H0 and Ha and carry out a t test. Give the P-value. What is your conclusion?
(b) Give a 95% confidence interval for the mean difference in hemoglobin level between the two populations of infants.
(c) State the assumptions that your procedures in parts (a) and (b) require to be valid.
hen investigating a relationship between birth weight and IQ, researchers found that 258 subjects with extremely low birth weights (less than 1000 g) had Wechsler IQ scores at age 8 with a mean of 95.5 and a standard deviation of 16.0.
According to the Bureau of Economic Analysis, the savings rate of American households, defined as a percentage of the disposable personal income, was 4.20% in 2009.
Scores by women on the SAT-I test are normally distributed with a mean score of 998 and a standard deviation of 202. scores by women on the ACT test are normally distributed with a mean of 20.9 and a standard deviation of 4.6 assume the two tests ..
question assume that charlotte has two stocks disney d and amazon a. for each of these stocks the possible percent
Create an initial post in which you analyse key social and/or ethical issues, of your choosing, associated with social networking websites. Start by summarising your selected ethical/social issues, and explain why you think these issues are import..
A coin with the probability of heads being 0.8 is tossed 4 tim
In what way do researchers take a risk if they do not pilot test the independent variable they plan to use in an experiment?
the capacity bits of the largest dram dynamic random access memory chips commonly available at retail has increased as
suppose the prelliminary results were as follows group 1 n=310,p=32 and group 2 n=309,p=20 construct a 95% confidence interval for the difference in proportions of patients with new hair growth for the two groups using the given data.
Modern micro analytical systems used for polymerase chain reaction (PCR) requires, fast damped tracking response. The control of the temperature of the PCR reactor can be represented as shown in Figure DP10.11.
Fixed construction cost for upper-deck area is evaluated to be $1,500,000, with variable cost of $50,000 for each box constructed. Determine the breakeven point for number of luxury boxes in new stadium?
From the shipment you take a random sample of 20. When sampling with replacement (binomial), determine the probability of obtaining: Exactly two defective components in the sample of 20.
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