An investigator conducts a study to investigate whether

Reference no: EM13619213

An investigator conducts a study to investigate whether there is a difference in mean PEF in children with chronic bronchitis as compared to those without. Data on PEF are collected and summarized below. Based on the data, is there statistical evidence of a lower mean PEF in children with chronic bronchitis as compared to those without? Apply the appropriate test at alpha=0.05.

Group	Number of Children	Mean PEF	Std Dev PEF
Chronic Bronchitis	25	281	68
No Chronic Bronchitis	25	319	74

1. Critical t value:

2. Computed t:

3. Based on comparing the critical t value to the computed t value which of the following is (are) true? a. There is statistical evidence of a lower mean PEF in children with chronic bronchitis as compared to those without. b. There is not statistical evidence of a lower mean PEF in children with chronic bronchitis as compared to those without. c. There are not enough data points to reach a conclusion. d. b and c.

Reference no: EM13619213

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