The margin of error in a confidence interval is calculated using what property of the sampling distribution? O a. Mean b. Symmetry O C. Standard error O d. Degrees of freedom Clear my choice The t-distribution approximates the normal distribution as you increase which of the following under the t-distribution? O a. Sample size O b. Variables under study O c. Population mean value O d. Number of assumptions A protein bar is advertised weighing 34g. When a sample of 25 bars is measured, a mean of 34.2g with a standard deviation of 0.6g is found. What is the 95% confidence interval for this sample? O a. (31.72,36.68) O b. (33.75,34.25) O c. (33.95,34.45) O d. (34.0,34.41)

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