Introduction to BioStatistics

The income range of attendees at a research conference is gathered as upper, middle, and low levels. What type of data is collected? (Points : 1)        Nominal        Ordinal        Interval       Ratio A sample of 80 juvenile salmon is grouped into the resulting frequency distribution based on their weights.   Weight (in grams) Frequency 100-149 15 150-199 10 200-249 30 250-299 25   If a Pie Chart were constructed for the weights of the salmon, what would be the measure of the central angle for the class weighing 200-249 grams? (Points : 0.5)        67.5°        112.5°        135°        45° According to the California Department of Health Services, 83% of Californians over 25 are not obese. If twenty Californians over 25 are randomly selected, what is the probability that all twenty are not obese? Give your answer to three decimals, e.g., .987 . (Points : 1)

Use the following probability distribution for this next question. Biologists researching a certain type of hawk, Accipiter spp., found the following probability values for x, the number of offspring.

x	P(x)
0	.05
1	.19
2	.32
3	.21
4	.12
5	.08
6	.03

Find the standard deviation of the probability distribution for offspring of Accipiter spp. Give your answer to one decimal, e.g., 1.2 . (Points : 0.5)

      

Use the Standard Normal distribution to answer this question. Identify the probability corresponding to a z-score of less than -1.33. (Points : 1)

       .0918        .9082        .8165        .6239

Use the Poisson distribution for this question. For a science laboratory experiment, the average number of radioactive particles passing through a counter in a millisecond is four. Find the probability that at most three particles pass through the counter in a given millisecond. Give your answer to three decimals, e.g., .987 . (Points : 1)

Use the normal distribution for this question. The mean maximum aerobic power (VO 2MAX score for women ages 20 to 29 is 36 ml/min/kg with a standard deviation of 7 ml/min/kg. Find the probability of a woman between the ages of 20 to 29 having a VO2MAX score of between 30 ml/min/kg and 42 ml/min/kg. Give your answer to three decimals, e.g., .987 . (Points : 1)

Find the minimum sample size required to estimate a population proportion p . Margin of error: four percentage points; confidence level: 95%; from a prior study, p is estimated by = .125 . Round your answer up to the nearest integer. (Points : 1)

Assume that a simple random sample has been taken, the population standard deviation is not known, and the population is normally distributed. Medical researchers studying cochlear implants, devices placed behind the bone in the ear to improve hearing, found the following number of implants over the last twelve years in children under 3 years old. Use a 90% confidence level and the following sample data: 40    90    99    120   150   220   300   320   460   520   600   650 Use the sample data and confidence level to construct a confidence interval estimate of the population mean µ. Give your answer to with one decimal, e.g., (123.4,567.8) . (Points : 0.5)

      

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