The quality control department has collected data on defective products produced over a 24-hour time span. Using a random sample of 800 products, they discover that the average number of defects is 248, while the sample standard deviation is 35. The department wants to conduct a test of whether the average number of defective product is 250 or not. Which of the following statements is true? I. The null hypothesis can be rejected with a confidence level of 60% or above. II. The null hypothesis can be rejected with a confidence level of 97.5% or above. A) I only B) II only C) Both I and II D) Neither I nor II

The quality control department has collected data on defective products produced over a 24-hour time span. Using a random sample of 800 products, they discover that the average number of defects is 248, while the sample standard deviation is 35. The department wants to conduct a test of whether the average number of defective product is 250 or not. Which of the following statements is true? I. The null hypothesis can be rejected with a confidence level of 60% or above. II. The null hypothesis can be rejected with a confidence level of 97.5% or above. A) I only B) II only C) Both I and II D) Neither I nor II

Glencoe Algebra 1, Student Edition, 9780079039897, 0079039898, 2018

18th Edition

ISBN:9780079039897

Author:Carter

Publisher:Carter

Chapter4: Equations Of Linear Functions

Section: Chapter Questions

Problem 8SGR

See similar textbooks

Similar questions

What is meant by the sample space of an experiment?
A researcher for the National Highway Traffic Safety Administration wishes to estimate the average bloodalcohol concentration (BAC) for drivers involved in fatal accidents who are found to have positive BAC values.He randomly selects records from 1,200 such drivers and determines the sample mean BAC to be 0.16g/dL.and standard deviation 0.08 g/dL. Construct a 96% confidence interval for the mean BAC.
The quality control department has collected data on defective productsproduced over a 24-hour time span. Using a random sample of 800 products, theydiscover that the average number of defects is 248, while the sample standard deviationis 35. The department wants to conduct a test of whether the average number ofdefective product is 250 or not. Which of the following statements is true?I. The null hypothesis can be rejected with a confidence level of 60%.II. The null hypothesis can be rejected with a confidence level of 97.5%.A) I onlyB) II onlyC) Both I and IID) Neither I nor II
According to the Statistical Abstract of the United States, the mean family size in 2010 was 3.14 persons. Suppose a random sample of 225 families taken this year yields a sample mean size of 3.05 persons, and suppose we assume the population standard deviation of family sizes is o = 1 person. Using a 5% significance level, test the hypothesis that the mean family size has decreased since 2010. Perform your hypothesis test, and select the best interpretation of your results from the choices below. Select one: O a. At the 5% level of significance the data are statistically significant. We cannot determine the average family size has decreased since 2010. O b. At the 5% level of significance the data are statisticall significant. We can determine the average family size has decreased since 2010. O c. At the 5% level of significance the data is not statistically significant. We cannot conclude the average family size has decreased since 2010. O d. At the 5% level of significance the data…
From the scores in subject statistics for 8 students, it was found that the mean score is 73 and the standard deviation is 5.15. Construct a 95% confidence interval estimate for the mean score of all students in the class.
A gardener is testing a new type of carrot. From a sample of 15 carrots, she calculates a mean length of 7.2 inches and standard deviation of 1.23 inches. Find a 95% confidence interval for the mean length of this new type of carrot.
After a sewer spill into a lake, an environmentalist wanted to test to see if the water was safe (mean bacteria count per unit volume of water is less than 200). Ten samples along different locations of the lake resulted in a sample mean of 192.7 and a sample standard deviation of 10.81. 2. a. Construct a 95% confidence interval for the mean.
In a random sample of 28 people, the mean commute time to work was 33.3 minutes and the standard deviation was 7.1 minutes. Assume the population is normally distributed and use a t-distribution to construct a 90% confidence interval for the population mean u . What is the margin of error of u? Interpret the results.
The high school athletic director is asked if football players are doing as well academically as the other student athletes. We know from a previous study that the average GPA for the student athletes is 3.10. After an initiative to help improve the GPA of student athletes, the athletic director randomly samples 20 football players and finds that the average GPA of the sample is 3.18 with a sample standard deviation of 0.54. Is there a significant improvement? Use a 0.05 significance level. Hypothesis Step 1: Cleary state the null and alternative hypotheses. ALTERNATIVE HYPOTHESIS: ____3.18_________more than____3.10__________________ Hypothesis Step 2: Identify the appropriate significance level and confirm the test assumptions.
In a random sample of 24 people, the mean commute time to work was 31.9 minutes and the standard deviation was 7.2 minutes. Assume the population is normally distributed and use a t-distribution to construct a 90% confidence interval for the population mean u. What is the margin of error of u? Interpret the results.