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nesis, then we conclude that the null hypothesis has been proven to be true Question 23 10 pts In research on cell phone use by teenagers it was found that the average connect time for a call was 15 minutes. Test whether the average connect time has changed. To test this claim, cell phone bills for 15 teenagers were evaluated. The sample mean time spent was 18.5 minutes with a sample standard deviation of four minutes (assume a normal distribution). What is the absolute value of the critical value of the test statistic for a = 0.01 to test the hypotheses? O 2.145 O 2977 O 2.576 O 2.947 O 2.624 10 pts