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Ci... What IS lavender oil? 1. An SRS of 100 postal employees found that the average amount of time these employees had worked for the U.S. Postal Service was x = 7 years, with a standard deviation of s = 2 years. Assume the distribution of the time the population of all postal employees has worked for the Postal Service is approximately normal with mean u. Do the observed data represent evidence that u has changed from its value of 7.5 years of 20 years ago? To determine this, we test the hypotheses Ho: u = 7.5, Ha: p # 7.5 using the one-sample t test. Suppose the mean and standard deviation we obtained were based on a sample of 250 postal workers, rather than 100. The P-value would be * (1 Point) unchanged, since the difference between and the hypothesized value m = 7.5 is unchanged. unchanged, since the variability measured by the standard deviation stays the same. smaller larger