Question

The two intervals (113.5, 114.5) and (113.3, 114.7) are confidence intervals for ? = mean resonance frequency (in hertz) for all tennis rackets of a certain type. The two intervals were calculated using the same sample data. (a) What is the value of the sample mean (in hertz) resonance frequency? x? = Hz (b) The confidence level for one of these intervals is 90%, and for the other it is 99%. Which is which, and how can you tell? The 99% confidence interval is ---Select--- than the 90% confidence interval, because the t critical value for 99% confidence is ---Select--- than the t critical value for 90% confidence. Therefore, the 90% interval is ---Select--- Hz and the 99% interval is ---Select--- Hz.

          The two intervals (113.5, 114.5) and (113.3, 114.7) are confidence intervals for ? = mean resonance frequency (in hertz) for all tennis rackets of a certain type. The two intervals were calculated using the same sample data.

(a) What is the value of the sample mean (in hertz) resonance frequency?
x? = Hz

(b) The confidence level for one of these intervals is 90%, and for the other it is 99%. Which is which, and how can you tell?

The 99% confidence interval is ---Select--- than the 90% confidence interval, because the t critical value for 99% confidence is ---Select--- than the t critical value for 90% confidence. Therefore, the 90% interval is ---Select--- Hz and the 99% interval is ---Select--- Hz.

The two intervals (113.5, 114.5) and (113.3, 114.7) are confidence intervals for ? = mean resonance frequency (in hertz) for all tennis rackets of a certain type. The two intervals were calculated using the same sample data.

(a) What is the value of the sample mean (in hertz) resonance frequency?
x? = Hz

(b) The confidence level for one of these intervals is 90%, and for the other it is 99%. Which is which, and how can you tell?

The 99% confidence interval is ---Select--- than the 90% confidence interval, because the t critical value for 99% confidence is ---Select--- than the t critical value for 90% confidence. Therefore, the 90% interval is ---Select--- Hz and the 99% interval is ---Select--- Hz.

Added by Lu-S M.

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