A 1980 study was conducted whose purpose was to compare the indoor air quality in offices where smoking was permitted with that in offices where smoking was not permitted. Measurements were made of carbon monoxide (CO) at 1:20 p.m. in 40 work areas where smoking was permitted and in 40 work areas where smoking was not permitted. Where smoking was permitted, the mean CO level was 11.6 parts per million (ppm) and the standard deviation CO was 7.3 ppm. Where smoking was not permitted, the mean CO was 6.9 ppm and the standard deviation CO was 2.7 ppm. Assuming the unequal variances, test for whether or not the mean CO is significantly different in the two types of working environments. Step 1: State the hypotheses Step 2: State the level of significance Step 3: Compute the test statistic. -Compute for t using the formula mentioned in the video and round off to two decimal places. -Use the link provided in the previous sessions to determine the following: a) critical values b) p-value
Continuous Probability Distributions
Probability distributions are of two types, which are continuous probability distributions and discrete probability distributions. A continuous probability distribution contains an infinite number of values. For example, if time is infinite: you could count from 0 to a trillion seconds, billion seconds, so on indefinitely. A discrete probability distribution consists of only a countable set of possible values.
Normal Distribution
Suppose we had to design a bathroom weighing scale, how would we decide what should be the range of the weighing machine? Would we take the highest recorded human weight in history and use that as the upper limit for our weighing scale? This may not be a great idea as the sensitivity of the scale would get reduced if the range is too large. At the same time, if we keep the upper limit too low, it may not be usable for a large percentage of the population!
A 1980 study was conducted whose purpose was to compare the indoor air quality in offices where smoking was permitted with that in offices where smoking was not permitted. Measurements were made of carbon monoxide (CO) at 1:20 p.m. in 40 work areas where smoking was permitted and in 40 work areas where smoking was not permitted. Where smoking was permitted, the
Step 1: State the hypotheses
Step 2: State the level of significance
Step 3: Compute the test statistic.
-Compute for t using the formula mentioned in the video and round off to two decimal places.
-Use the link provided in the previous sessions to determine the following:
a) critical values
b) p-value
Step 4: Make a decision
-Reject or do not reject Ho.
-State the conclusion.
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