For an anova comparing three treatment conditions, what is stated by the alternative hypothesis (h1)? there are no differences between any of the population means. at least one of the three population means is different from another mean. all three of the population means are different from each other. none of the other choices is correct.

The correct answer is "at least one of the three population means is different from another mean". In population anova comparing studies the null hypothesis states that the mean of all of the studied treatment conditions are equal. The alternative hypothesis should be the contrary of which was is stated in the null hypothesis, which is at least one mean is different from the others.

hygrometers and hair thermometers (often found as part of hygrometers/psychrometers) can be used to measure humidity. barometers are used to measure atmospheric pressure, while anemometers are used to measure wind speed. so the 2nd and 4th choices should be the correct answers.