Company X claims that its cell phones last significantly longer than cell phones sold by Company Y. The company collected the mean length of time that cell phones from each company last before needing to be replaced. Sample Mean Sample Standard Deviation Sample Size Company A Company B 3.456 2.876 0.68 80 80 Is there sufficient evidence to reject the null hypothesis (that the mean length of time for the two populations is equal) at a significance level of 0.01? Oz-score = 4.7657, P-value < 0.00001; reject the null hypothesis Oz-score = 4.7657, P-value < 0.00001; fail to reject the null hypothesis 1-score = 6.7398, P-value <0.00001; reject the null hypothesis Or-score = 6.7398, P-value < 0.00001; fail to reject the null hypothesis

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