Question

Statistics

3. A prospective cohort study is run to estimate the incidence of stroke in persons 55 years of age and older. All participants are free of stroke at study start. Each participant is followed for a maximum of 5 years. The data are summarized below.

\begin{array}{|l|c|c|} & \text{^^20Number^^20of^^20Strokes^^20} & \begin{array}{c}\text{^^20Number^^20of^^20Stroke^^20Free^^20} \\ \text{^^20Person^^2dYears^^20}\end{array} \\ \text{^^20Men^^20}(\mathrm{n}=125) & 11 & 487 \\ \text{^^20Women^^20}(\mathrm{n}=200) & 24 & 947 \\ \end{array}

a. What is the annual incidence rate of stroke in men?

b. What is the annual incidence rate of stroke in women?

c. What is the annual incidence rate of stroke (men and women combined)?  Verified ### Question 37038  Statistics

Let {X1, X2,...XN} be a random sample where each random variable X, has a PDF given by
f(x)=\frac{1}{(\lambda+\mu)} e^{\frac{1}{2}[-(\operatorname{sign}(x)+1)(x / \lambda)+(\operatorname{sign}(x)-1)(x / \mu)]}
\operatorname{sign}(x)=\left\{\begin{array}{rr} 1, & x \geq 0 \\ -1, & x<0 \end{array}\right.
where the sign function is defined as
and N denoting an integer, and the parameters , µ satisfying 1 > 0, µ > 0.In the followings provide complete derivations and explanations of results.
a) Find the likelihood function and the log-likelihood function for the parameters 1,µ
b) Find Maximum Likelihood (ML) estimators for the parameters 1, u.
c) Determine if these ML estimators are unbiased for N = 1.

### Question 33214  Statistics

How many ways can 4 pairs of socks be chosen from 16 pairs?
O 1820
O 496
O43680

### Question 33213  Statistics

How many subsets of {1,2,.... 20} have three elements?
O 5814
01140
O 969
O 6840

### Question 33212  Statistics

Suppose there are eight different colors of flowers in a flower vase. How many different ways we select three different colors of flowers from the vase?
0 6720
O 336
06
56O 56

### Question 33209  Statistics

How many eight-digit integers are there that do not contain repeated digits?
O 10-9 8 7-6 5-4-3
09.9.8-7-6 5 4-3
O P(10, 8)
O P(9, 8)

### Question 33207  Statistics

How many 2-permutations of {a, b, c, d)?
O 12
O 24
O 10
O 35

### Question 33206  Statistics

How many permutations of the letters ABCDEFG contain the string "BC" and "FG'as a substrings?
O 120
0720
O 2520

### Question 33205  Statistics

How many permutations of the letters ABCDEFG contain the string "ABC as a substring?
O 5040
0 120
O 24
0720

### Question 33204  Statistics

How many different order can there a set with {a, b. c. 4. 5. Š}?
O 120
O 1040
0720
O 24

### Question 33203  Statistics

How many numbers from the set of integers between 1 and 1000, inclusive, are divisible by 2 or 5.
O 600
O 500
O 300
0400

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