If a treatment produces a sample mean of M = 25 with s = 18 among a sample of n = 36, which t-statistic should be obtained and which decision should be made if conducting a two-tailed hypothesis test with α = .05 and an expected mean of µ= 30?     a. t = -1.39 and fail to reject H0   b. t = -1.67 and fail to reject H0   c. t = -1.39 and reject H0   d. t = -1.67 and reject H0

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If a treatment produces a sample mean of M = 25 with s = 18 among a sample of n = 36, which t-statistic should be obtained and which decision should be made if conducting a two-tailed hypothesis test with α = .05 and an expected mean of µ= 30?
 
  a.
t = -1.39 and fail to reject H0
  b.
t = -1.67 and fail to reject H0
  c.
t = -1.39 and reject H0
  d.
t = -1.67 and reject H0
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