Naika IHP 525 Quiz One - Biostatistics Module One Quiz One - Module one test PDF

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Biostatistics Module One Quiz One - Module one test...

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IHP 525 Quiz One 1. Prospective studies on nutrition often require subjects to keep detailed daily dietary logs. In contrast, retrospective studies often rely on recall. Which method (dietary logs or retrospective recall) do you believe is more likely to achieve accurate results? Explain your response. The accurate results will be best achieved through the daily dietary logs. The reason is because the information is recorded at daily at the time of the occurrence but the recall method is not recorded at the time of occurrence and it’s not recorded daily. 2. We often have a choice of whether to record a given variable on either a quantitative (continuous) or a categorical scale. a) How does one measure age quantitatively? This can be measured by month or year. b) Provide an example by which age can be measured categorically. An example of age that can be measure categorically can be young or old 3. Telephone surveys may use a telephone directory to identify individuals for a study. Speculate on the type of household that would be underrepresented by using this sampling frame. The household that would be underrepresented will the household that doesn’t have their phone registered, those that don’t have phone and those that only have a private phone. 4. Could the number “0000” appear in a table of random digits? If so, how likely is this? The number “0000” would occur in the table of random digits 1 every 10,000 5. Body weights of 18 diabetics expressed as a percentage of ideal (defined as body weight divided by ideal body weight x 100) are listed: {107, 119, 99, 114, 120, 104, 88, 114, 124, 116, 101, 121, 152, 100, 125, 114, 95, 117}. Construct a stem-and-leaf plot or box plot of these data and describe the distribution. I will construct the stem-and-leaf plot for this question 08|8 09|5 9 10|0 1 4 7 11|4 4 4 6 7 9 12|0 1 4 5 13| 14| 15|2 X10 The location of the median is 114, the spread is from 88 to 152 and lastly the shape is a negative skew distribution due to the outlier of 152 which make the tail of the distribution being longer on the right side of the graph (if there was a graph made) 6. Which two measures of central location are equal when data follow a perfectly normal distribution? The two measures of central location that will be equal are the mean and the median when the distribution is perfectly normal.

7. To assess the air quality in a surgical suite, the presence of colony-forming spores per cubic meter of air is measured on three successive days. The results are as follows: {12, 24, 30}. Calculate the mean and standard deviation for these data.

12+24 + 30 =22 3 12− 22 ¿ ¿ 24 −22 ¿ ¿ 30 −22 Standard deviation= ¿ ¿ ¿2 ¿ ∑¿ ¿ √¿

Mean=

8. In a lottery game, a person must select 5 numbers from a total of 40. Tracy has chosen 7, 8, 9, 10, 11. Jaime has chosen 39, 17, 37, 5, 28. Who has a greater chance of winning? The combination for the win is 658008 because Tracy and Jaime have chosen number that are part of the combination for the win, they both have an equal chance to win the lottery.

9. In a box, there are 8 orange, 7 blue, and 6 red balls. One ball is selected randomly. What is the probability that it is neither orange nor red? First the total number of the ball need to be calculated 8+7+6= 21 The blue balls are 7 To calculate probability of not getting either orange or red mean the calculate the probability of getting the blue ball. The calculation will be 7/21=1/3 The probability that is neither orange nor red is 1/3...