Question

A random sample of n = 12 individuals is selected from a population with µ = 70, and a treatment is administered to each individual in the sample. After treatment, the sample mean is found to be M = 74.5 with SS = 297. Use the Distributions tool to help answer the questions that follow.

t Distribution

Degrees of Freedom = 21

-3.0-2.0-1.00.01.02.03.0x.5000.50000.000

QUESTION: How much difference is there between the mean for the treated sample and the mean for the original population _________________?? (Note: In a hypothesis test, this value forms the numerator of the t statistic.)

QUESTION: If there is no treatment effect, how much difference is expected just by chance between the sample mean and its population mean______________________?? That is, find the standard error for M. (Note: In a hypothesis test, this value is the denominator of the t statistic.)

QUESTION: Based on the sample data, does the treatment have a significant effect? Use a two-tailed test with α = .05. (Show three decimal places.)

t-critical	=	±
t	=

QUESTION: The results indicate:

A) Rejection of the null hypothesis; there is a significant treatment effect.

B) Failure to reject the null hypothesis; there is a significant treatment effect.

C) Rejection of the null hypothesis; there is not a significant treatment effect.

D) Failure to reject the null hypothesis; there is not a significant treatment effect.

Answer 1

Answer 2

British Received Pronunciation (RP), traditionally defined as the standard speech used in London and southeastern England, is one of many forms (or accents) of standard speech throughout the English-speaking world. Other pronunciations, although not standard, are often heard in the public domain. A very small percentage of the population of England is estimated to use “pure” RP (although the actual percentage is as unknown as what constitutes “pure” RP). It is considered the prestige accent in such institutions as the civil service and the BBC and, as such, has fraught associations with wealth and privilege in Britain.