1. Find the following t -values in the Critical Values of t table. (Enter your a

Question

1. Find the following t-values in the Critical Values of t table. (Enter your answers to three decimal places.)

(a)    t0.05 for 5 df

t0.05 =

(b)    t0.025 for 9 df

t0.025 =

(c)    t0.10 for 19 df

t0.10 =

(d)    t0.025 for 33 df

t0.025 =

2. A random sample of 100 observations from a quantitative population produced a sample mean of 20.8 and a sample standard deviation of 7.2. Use the p-value approach to determine whether the population mean is different from 22. Explain your conclusions. (Use = 0.05. Round your test statistic to two decimal places and your p-value to four decimal places.)

Test statistic:  z =  

p-value =  

3. According to a survey in PARADE magazine, almost half of parents say their children's weight is fine. Only 9% of parents describe their children as overweight. However, the American Obesity Association says the number of overweight children and teens is at least 15%. Suppose that you sample n = 650 parents and the number who describe their children as overweight is x = 46.

Test statistic:  z =  

Rejection region:  Use a significance level = 0.05. If the test is one-tailed, enter NONE for the unused region.

Explanation / Answer

1)

Solution :

Using t table ,

(a) t0.05 for 5 df

t0.05 = 2.571

(b) t0.025 for 9 df

t0.025 = 2.685

(c) t0.10 for 19 df

t0.10 = 1.729

(d)    t0.025 for 33 df

t0.025 = 2.348

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