GPA: The mean GPA at a certain university is 3.37. Following are GPAs for a random sample of 16 business students from this university. 2.20 2.45 2.26 2.36 3.35 3.65 3.25 3.65 2.85 2.45 2.65 3.45 3.81 3.74 2.75 2.93 Following is a boxplot of the data (b) Assume that the population standard deviation is σ=0.7 If appropriate, perform a hypothesis test at the α=0.01 level to determine whether the mean GPA for business students is less than the mean GPA at the whole university. What do you conclude? Use the P-value method with the TI-84 calculator. State the null and alternate hypotheses. H0: H1: This hypothesis test is a ______test.
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!
GPA: The mean GPA at a certain university is 3.37. Following are GPAs for a random sample of 16 business students from this university.
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2.20
|
2.45
|
2.26
|
2.36
|
3.35
|
3.65
|
3.25
|
3.65
|
|
2.85
|
2.45
|
2.65
|
3.45
|
3.81
|
3.74
|
2.75
|
2.93
|
Following is a boxplot of the data
(b) Assume that the population standard deviation is σ=0.7 If appropriate, perform a hypothesis test at the α=0.01 level to determine whether the mean GPA for business students is less than the mean GPA at the whole university. What do you conclude? Use the P-value method with the TI-84 calculator.
State the null and alternate hypotheses.
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H0:
H1:
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