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Hypothesis Testing: Pooled T-test

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Wize University Statistics Textbook > Inference for Two Population Means

Pooled t-test

3 Activities

They say eating an apple a day keeps the doctor away. 18 children are given an apple a day for a few years. Their mean visits to the doctor is 1.72 with a standard deviation of 0.24. A separate group of 12 children are told not to eat an apple for a few years. Their mean visits to the doctor is 1.90 with a standard deviation of 0.23.
At the 10% level of significance, is there evidence that an apple a day reduces the number of doctor visits?
More Pooled t-test Questions:
Hypothesis Testing: Pooled T-test
They say eating an apple a day keeps the doctor away. 18 children are given an apple a day for a few years. Their mean visits to the doctor is 1.72 with a standard deviation of 0.24. A separate group of 12 children are told not to eat an apple for a few years. Their mean visits to the doctor is 1.90 with a standard deviation of 0.23.
At the 10% level of significance, is there evidence that an apple a day reduces the number of doctor visits?
Hypothesis Testing: Pooled t-test
Is there evidence, at the 5% significance level, that house prices in Town A and Town B differ?
Town ATown BMean House Price$635,015$595,485Standard Deviation$157,256$124,368n127109\begin{array}{|l|c|c|}\hline &\text{Town A}&\text{Town B}\\\hline \text{Mean House Price} & \$635,015 & \$595,485\\\hline \text{Standard Deviation} & \$157,256 & \$124,368\\\hline n & 127 & 109 \\\hline \end{array}
Pooled t-test
Is there evidence, at the 5% significance level, that house prices in Town A and Town B differ?
Town ATown BMean House Price$635,015$595,485Standard Deviation$157,256$124,368n127109\begin{array}{|l|c|c|}\hline &\text{Town A}&\text{Town B}\\\hline \text{Mean House Price} & \$635,015 & \$595,485\\\hline \text{Standard Deviation} & \$157,256 & \$124,368\\\hline n & 127 & 109 \\\hline \end{array}