The Next Questions Are Based On The Following Information:
The manufacturer of a new chewing gum claims that at least 80% of dentists surveyed prefer their type of gum and recommend it for their patients who chew gum.An independent consumer research firm decides to test their claim.The findings in a sample of 200 dentists indicate that 74.1% of the respondents do actually prefer their gum.
-If conducting a two-sided test of population means,unknown variance,at level of significance 0.05 based on a sample of size 20,the critical t-value is:
A)1.725
B)2.093
C)2.086
D)1.729

Question

Quizplus · Accepted Answer

For a two-sided test of population means with unknown variance at a significance level of 0.05 and a sample size of 20, the degrees of freedom (df) would be 19 (n-1). Looking up the critical t-value for df=19 in a t-distribution table for a two-tailed test with α=0.05, the correct critical t-value is approximately 2.093.

The Next Questions Are Based on the Following Information