To find out what proportion of dogs are given heartworm medication, we survey 50
ID: 3050663 • Letter: T
Question
To find out what proportion of dogs are given heartworm medication, we survey 50 dog owners by telephone each night for a period of 20 nights. From the data collected, twenty different sample proportions and 95 percent confidence intervals (one for each night's sample) were computed 1) Would expect all 20 confidence intervals to contain the true value of the population proportion? NO YES Tries 0/1 2) Do all 20 of the confidence intervals have the same length? Yes No Tries 0/1 3) Suppose you calculated 90% confidence intervals instead of 95% confidence intervals, would they be narrower or wider? Wider Tries 0/1 the 90% confidence inter als constructed using n- o 4 suppose you surveyed 100 dog owners by telephone each night instead of 50 would the width constructed using n=50 ? e na ro er or wider han the %confidence intervals Narrower Wider Tries 0/1 5) what about 99% confidence intervals-for the same sample size, would they be narrower or wider than 95% confidence intervals ? Narrower Wider Tries 0/1Explanation / Answer
1. NO
only 95% of all possible intervals would contain the true value.
2. NO
Length wont be same as standard deviations would vary.
3. Wider
Decrease in confidence increases the width of intervals.
4. Narrower
Increase in sample size decreases the width.
5. Narrower
Increase in confidence decreases the width of intervals.