TR or F The 95 percent confidence interval state that 95 percent of the sample means of a specified sample size selected from a population will be within plus and minus 1.96 standard deviations of the hypothesized population mean
TR or F The t distribution is positively skewed.
TR or F The first step in testing the hypothesis is to state the decision rule
TR or F There is only three levels of significance that is applied to all studies involving sampling.
TR or F The researcher must decide on the level of significance before formulating a decision
rule.
1.A random sample of 20 group leaders, supervisors, and similar personnel revealed that on the average a person spent 6. 5 years on the job before been promoted.
The population standard deviation was 1.6 years.
Using the 98 % level of confidence, what is the confidence interval within which the population mean lies?
Answer: ________________________________
Construct a 90% of confidence interval for the mean cholesterol content of all such eggs.
Answer:__________________________
Please, interpret your resulting of confidence interval.
Answer:____________________________
Construct a 99 % confidence interval for the proportion of U. S. adults who believe that it wouldn’t make difference which party is in power.
Answer:___________________________________
In a random sample of 150 heads of households, 100 responded that they owned their homes.
At a= 0.04 level of significance, does that indicate a difference from the national proportion?
What is the null hypothesis ? _________________
What is alternate hypothesis? ____________________________
Is this one-tailed or two-tailed test? ______________
What is the critical value from table?
Answer:______________________ _________________________
What is the tested value? (value obtained from formula or TI-83 or StatCrunch .)
Answer______________________
What is the p-value ?
Answer________________________
What is your decision regarding null hypothesis. Explain why?
Answer:______________________
Use a= 0.01 level of significance.
What is the null hypothesis? __________________
What is an alternate hypothesis? ______________________
Is this one-tailed or two-tailed test? _______________________
What is the critical value from table?
Answer___________________
What is the tested value? (value obtained from formula or TI-83 or Statcrunch.)
Answer_______________
What is the p-value?
Answer:_________________
What is your decision regarding null hypothesis. Explain why you accept or reject it
Answer: ____________________________
A producer in another city claims that the length of time of productions in his city is the same.
He samples 20 shows and finds the time to be 2 hours 11 minutes with a sample standard deviation of 7 minutes. Using level of significance a= 0.05, is the producer correct?
What is the null hypothesis? ________________
What is alternate hypothesis? ________________
What is the critical value?
Answer:______________
What is the tested value? (formula value.)
Answer:_______________
What is the p-value?
Answer:_________________
What is your decision regarding null hypothesis?
Explain why?
Answer:___________________
One sample showed that among 780 randomly selected students who
completed four years of college 20% smoke . Use a= 0.05 significance level to test the claim that the rate of smoking among those with four years of college is less than the 26% rate for the general population.
What is the null hypothesis? _____________________
What is the alternate hypothesis?___________________
Is this one-tailed or two-tailed test? __________________
What is the critical value?
Answer:______________________
What is the tested value? (value obtained from formula or TI-83.)
Answer:______________________
What is the p-value?
Answer:_________________
What is your decision regarding null hypothesis? Explain why?
Answer:_______________________________________
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