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Question 2 1. A study on diabetes begins with one thousand 40 to 45-year-old men of which 60 are already diabetic. The remaining 940 men are followed for 5 years during which time 75 men develop diabetes. Calculate the prevalence of diabetes at the start of the study. Please express the answer in a percentage to 2 decimal places without the % symbol. For example, for a prevalence of 0.025 or 2.5%, enter the number 2.50. No other text is required. 2. Consider a class with 80 enrolled students. None of the students were ill at the beginning of the school year. On August 30th, 10 students reported having a common cold. All continued to be ill on September 1st, but all 10 recovered within 3 days. On September 15th, 5 more students had a cold. All of these students continued to be ill on September 16th, but all recovered 5 days later. In this example, assume that a person cannot have a cold more than once: Calculate the prevalence of the common cold in the class on September 1st. Please express the answer in a percentage to 2 decimal places without the % symbol. For example, for a prevalence of 0.025 or 2.5%, enter the number 2.50. No other text is required.

          Question 2
1. A study on diabetes begins with one thousand 40 to
45-year-old men of which 60 are already diabetic. The remaining 940
men are followed for 5 years during which time 75 men develop
diabetes.
Calculate the prevalence of diabetes at the start of the
study.
Please express the answer in a percentage to 2 decimal
places without the % symbol. For example, for a prevalence of 0.025
or 2.5%, enter the number 2.50. No other text is required.
2. 
Consider a class with 80 enrolled students. None of the students
were ill at the beginning of the school year. On August 30th, 10
students reported having a common cold. All continued to be ill on
September 1st, but all 10 recovered within 3 days. On September
15th, 5 more students had a cold. All of these students continued
to be ill on September 16th, but all recovered 5 days later. In
this example, assume that a person cannot have a cold more than
once:
Calculate the prevalence of the common cold in the class on
September 1st.
Please express the answer in a percentage to 2 decimal
places without the % symbol. For example, for a prevalence of 0.025
or 2.5%, enter the number 2.50. No other text is required.

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Added by Chad A.

Elementary Statistics a Step by Step Approach

Allan G. Bluman 9th Edition

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Solved by Expert Jon Southam

01/06/2022

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Question 2 1. A study on diabetes begins with one thousand 40 to 45-year-old men of which 60 are already diabetic. The remaining 940 men are followed for 5 years during which time 75 men develop diabetes. Calculate the prevalence of diabetes at the start of the study. Please express the answer in a percentage to 2 decimal places without the % symbol. For example, for a prevalence of 0.025 or 2.5%, enter the number 2.50. No other text is required. 2. Consider a class with 80 enrolled students. None of the students were ill at the beginning of the school year. On August 30th, 10 students reported having a common cold. All continued to be ill on September 1st, but all 10 recovered within 3 days. On September 15th, 5 more students had a cold. All of these students continued to be ill on September 16th, but all recovered 5 days later. In this example, assume that a person cannot have a cold more than once: Calculate the prevalence of the common cold in the class on September 1st. Please express the answer in a percentage to 2 decimal places without the % symbol. For example, for a prevalence of 0.025 or 2.5%, enter the number 2.50. No other text is required.

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Transcript

00:02 All right, so we're looking at the prevalence of something.

00:06 For the first part, we're looking at the prevalence of diabetes in a study, and we're given some information on this particular study, where they started with 1 ,040 -to -45 -year -old men, where 60 are already diabetic, and we're asked to figure out the prevalence of diabetes at the start of the study.

00:25 So at the start of the study, the prevalence was 60 out of 1 ,000, so as a percent, so it ends up being 6 percent.

00:37 And let me make bump this to percentage.

00:40 Oh, it says without the sign.

00:43 So let's see, let's do that.

00:48 So it's going to be six.

00:53 So 6 .00 percent will be based on how they want you to put the answer in there.

01:00 So there's that.

01:01 They give you some information about five years later, but that's not what they're asking.

01:04 They're asking at the start of the study.

01:07 So it's about reading, a lot of statistics is about reading the problem statement and reading a whole scenario.

01:14 In the second part of it, of this question, we're looking at a class where there are 80 students are looking at when they had colds.

01:23 And so at the beginning, no one had a cold.

01:25 August 30th, 10 had a cold.

01:29 Had a cold.

01:31 There were 10.

01:33 And then they all continue to be...

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