Is there a difference in the amount of airborne bacteria between carpeted and uncarpeted rooms? In an experiment, seven rooms were carpeted and seven were left uncarpeted. The rooms were similar in size and function. After a suitable period, the concentration of bacteria in the air was measured (in units of bacteria per cubic foot) in all of these rooms. The data and summaries are provided: x¯ s Carpeted rooms 184 22.0 Uncarpeted rooms 170 16.9 A 95% confidence interval for the difference in mean bacterial concentration in the air of carpeted rooms versus uncarpeted rooms (using the conservative value for the degrees of freedom) is: Select one: −11.7 to 39.7. −16.66 to 34.66. −7.47 to 31.47. −18.89 to 42.89.
Is there a difference in the amount of airborne bacteria between carpeted and uncarpeted rooms? In an experiment, seven rooms were carpeted and seven were left uncarpeted. The rooms were similar in size and
|
|
x¯
|
s |
|
Carpeted rooms |
184 |
22.0 |
|
Uncarpeted rooms |
170 |
16.9 |
A 95% confidence interval for the difference in mean bacterial concentration in the air of carpeted rooms versus uncarpeted rooms (using the conservative value for the degrees of freedom) is:
−11.7 to 39.7.
−16.66 to 34.66.
−7.47 to 31.47.
−18.89 to 42.89.
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