Quick quiz13. the use of the t-distribution 1. The formula for a 95% confidence
ID: 3172489 • Letter: Q
Question
Quick quiz13. the use of the t-distribution 1. The formula for a 95% confidence interval using the t-distribution is Xtt the sample size i what is the value of t For 2 and 3. A random sample of 5Supreme pizzas from Pizza Shack showed an average weight o 14lbs with a standard deviation of s ns S 2. Make a 95% confidence interval for the mean weight of these types of pizzas. I,S 3. Suppose the pizzasare advertized to be 1sts which ofthe following is likely to be correct? a. Pizza Shack's supreme pizzas are on average lighter weight than they should be. b. There is not enough evidence to indicate that the supreme pizzas are lighter weight than they should be in a fast food business showed that the 4. A random sample of the records of ors 8.3 average age is and the 202 It is suspected that the average age of workers has increased. In a past the average age of this population was66 Do the data show that the average age has statistically significantly increased? Do a hypothsis test.Explanation / Answer
1. t table value for 95% CI at n=8 is 2.365
2. For n=5, t =2.776
Mean=1.4 and sd=0.2
E=t*sd/sqrt(n)=0.248
CI=mean+/-E=1.4+/-0.248=(1.152,1.648)
3. a is correct answer
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