The object of a general chemistry experiment is to determine the amount (in millilitres [ml]) of sodium hydroxide (naoh) solution needed to neutralize 1 g of a specified acid. this will be an exact amount, but when the experiment is run in the laboratory, variation will occur as the result of experimental error. three titrations are made using phenolphthalein as an indicator of the neutrality of the solution (ph equals 7 for a neutral solution). the three volumes of naoh required to attain a ph of 7 in each of the three titrations are as follows: 82.15, 75.77, and 75.50 ml. use a 99% confidence interval to estimate the mean number of millilitres required to neutralize 1 g of the acid. (round your answers to three decimal places.)
to ml
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10.–/7 pointsmendstatc4 10.e.090.
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to test the effect of alcohol in increasing the reaction time to respond to a given stimulus, the reaction times of seven people were measured. after consuming 89 ml of 40% alcohol, the reaction time for each of the seven people was measured again. do the following data indicate that the mean reaction time after consuming alcohol was greater than the mean reaction time before consuming alcohol? use α = 0.05. (use
μbefore − μafter = μd.
round your answers to three decimal places.)
person 1 2 3 4 5 6 7 before3465261after7726365
1-2. null and alternative hypotheses:
h0: μd = 0 versus μd ≠ 0h0: μd = 0 versus μd < 0 h0: μd < 0 versus μd > 0h0: μd ≠ 0 versus μd = 0h0: μd = 0 versus μd > 0
3. test statistic: t =
4. rejection region: if the test is one-tailed, enter none for the unused region. t> t<
5. conclusion:
h0 is rejected. there is sufficient evidence to indicate that the mean reaction time is greater after consuming alcohol. h0 is rejected. there is insufficient evidence to indicate that the mean reaction time is greater after consuming alcohol. h0 is not rejected. there is insufficient evidence to indicate that the mean reaction time is greater after consuming alcohol. h0 is not rejected. there is sufficient evidence to indicate that the mean reaction time is greater after consuming alcohol