Two laboratory stafftitrated a 50.00 mL of hydrochloric acid with an unknown concentration with a standardized 0.1 N Sodium hydroxide. IICI + NAOII - NaCI + H20 The students obtained the following results: Student A: 23.17 mL., 22.69 mL, 23.25 mL, 22.97 mL Student B: 25.25 mL, 25.19 mL, 25.23 ml, 25.23 ml a. (Determine the mean and standard deviation for each data set. b. Which staff was more precise? Explain.

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Two laboratory staff titrated a 50.00 mL of hydrochloric acid with an unknown
concentration with a standardized 0.1 N Sodium hydroxide.
IICI I NAOII -- NaCI - H20
The students obtained the following results:
Student A: 23.17 mL, 22.69 mL, 23.25 mL, 22.97 mL
Student B: 25.25 mL., 25.19 mL, 25.23 mL, 25.23 mL
a. (Determine the mean and standard deviation for each data set.
b. Which staff was more precise? Explain.
c. If the unknown HCI sample has a concentration of 0.040 M, which staff is more accurate?
d.(5 points) Are the results (titration volumes) obtained by the two staff significantly different
at the 95% confidence level (Given: Sesoled = 0.28)?
e. Using the Q test, decide if the second measurement (22.69 mL) for staff A should be
discarded.
Transcribed Image Text:Two laboratory staff titrated a 50.00 mL of hydrochloric acid with an unknown concentration with a standardized 0.1 N Sodium hydroxide. IICI I NAOII -- NaCI - H20 The students obtained the following results: Student A: 23.17 mL, 22.69 mL, 23.25 mL, 22.97 mL Student B: 25.25 mL., 25.19 mL, 25.23 mL, 25.23 mL a. (Determine the mean and standard deviation for each data set. b. Which staff was more precise? Explain. c. If the unknown HCI sample has a concentration of 0.040 M, which staff is more accurate? d.(5 points) Are the results (titration volumes) obtained by the two staff significantly different at the 95% confidence level (Given: Sesoled = 0.28)? e. Using the Q test, decide if the second measurement (22.69 mL) for staff A should be discarded.
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