A cell phone manufacturer claims that the batteries in its latest model provide 20 hours of...
Fantastic news! We've Found the answer you've been seeking!
Question:
Transcribed Image Text:
A cell phone manufacturer claims that the batteries in its latest model provide 20 hours of continuous use. In order to verify this claim, and independent testing firm checks the battery life of 100 phones. They find that the batteries in these 100 phones last an average of 19 hours with a standard deviation of 5 hours. Conduct an appropriate hypothesis test to check whether the results from this sample provide sufficient evidence that the true mean battery life is significantly less than 20 hours. a) Is this a question about the sample mean or the sample proportion? Explain how you know. b) What is the most appropriate test, a two-tailed test, a right-tailed test, or a left- tailed test? Explain how you know. c) State the null and alternative hypotheses. Make sure to use proper notation. d) Calculate the test statistic. Make sure to show all your computations. e) Determine the P-value. Make sure to explain how you obtained the value. f) State the decision about the null hypothesis as well as the conclusion from your hypothesis test in the context of the problem. [MP2 also] A cell phone manufacturer claims that the batteries in its latest model provide 20 hours of continuous use. In order to verify this claim, and independent testing firm checks the battery life of 100 phones. They find that the batteries in these 100 phones last an average of 19 hours with a standard deviation of 5 hours. Conduct an appropriate hypothesis test to check whether the results from this sample provide sufficient evidence that the true mean battery life is significantly less than 20 hours. a) Is this a question about the sample mean or the sample proportion? Explain how you know. b) What is the most appropriate test, a two-tailed test, a right-tailed test, or a left- tailed test? Explain how you know. c) State the null and alternative hypotheses. Make sure to use proper notation. d) Calculate the test statistic. Make sure to show all your computations. e) Determine the P-value. Make sure to explain how you obtained the value. f) State the decision about the null hypothesis as well as the conclusion from your hypothesis test in the context of the problem. [MP2 also]
Expert Answer:
Answer rating: 100% (QA)
Solution Sample size n 100 Sample mean x 19 Sample standard deviation s ... View the full answer
Related Book For
Elementary Statistics
ISBN: 978-0538733502
11th edition
Authors: Robert R. Johnson, Patricia J. Kuby
Posted Date:
Students also viewed these accounting questions
-
A sales representative for a tire manufacturer claims that the company's steel-belted radials last at least 35,000 miles. A tire dealer decides to check that claim by testing eight of the tires. If...
-
A car manufacturer claims that the miles per gallon for a certain model has a mean equal to 40.5 miles with a standard deviation equal to 3.5 miles. Use the following data, obtained from a random...
-
A cereal manufacturer claims that the gross weight (including packaging) of a box of cereal labeled as weighing 12 oz has a mean of 12.2 oz and a standard deviation of 0.1 oz. You gather 75 boxes and...
-
Because the entries in the present value table (Table 13 - 3) are reciprocals of the corresponding entries in the future value table (Table 13 - 1), how can Table 13 - 3 be used to find the future...
-
How many license plates can you make when a license plate consists of 1. Six (out of 26) alphabetical letters, each of which can be repeated? 2. Six (out of 26) alphabetical letters, each of which...
-
What should analysts do when they have validated that there are bugs in the program?
-
Why is involvement of top management important to the success of a corporate environmental management and accounting system?
-
Three students scheduled interviews for summer employment at the Brookwood Institute. In each case the interview results in either an offer for a position or no offer. Experimental outcomes are...
-
USE MANAGEMENT STRATEGIES AND TOPICS TO ANSWER THE QUESTION THAT IS DERIVED FROM THIS ARTICLE. ENSURE TACTICS ARE RELEVANT TO THE CASE AND ARTICLE (ESPECIALLY FROM THE KEEPING UP SECTION) How might...
-
The Home Depot is the worlds largest home improvement retailer and one of the largest retailers in the United States based on net sales volume. The Home Depot operates over 2,200 Home Depot stores...
-
Dave operates his business out of a small store, so he doesn't have a lot of shelf space for his products. Recently some additional shelf space became available. Dave is trying to decide which of his...
-
On January 3 0 , Pier 5 Inc. issued 5 0 0 shares of $ 1 par common stock for $ 1 5 per share. On June 3 0 , Pier 5 Inc. reacquired 5 0 shares of common stock at $ 1 2 per share and immediately...
-
Peruse your library or internet and select a company's annual report that you find compelling and interesting. There are many annual reports readilyviewable online and some of them are digital which...
-
How does the concept of a foreign key serve as a pivotal mechanism in relational database design, facilitating the establishment of referential integrity ?
-
How do emerging technologies, such as blockchain and distributed ledger technology, disrupt traditional database paradigms by introducing decentralized consensus mechanisms, immutable data storage,...
-
How do database management systems employ advanced indexing structures, such as B-trees and hash tables, to optimize query performance and facilitate efficient data retrieval?
-
What are the implications of molecular genetics in understanding evolutionary relationships and tracing the ancestry of organisms ?
-
You are a Loan Officer with an Investment Bank. Today you need to set your lending parameters. They are: LTV: 55% 10 Year T-Bill: TBD Rate Markup: 300 Basis Points Term: 30 Years Amortization: 30...
-
Suppose that A and B are events defined on a common sample space and that the following probabilities are known: P(A) =0.4 P(B) = 0.3 and P(A or B) = 0.66. Find P (A.B).
-
Determine the value of the confidence coefficient z(a/2) for each situation described: a. 98% confidence b. 99% confidence
-
a. If b is assigned the value 0.001, what are we saying about the type II error? b. If b is assigned the value 0.05, what are we saying about the type II error? c. If b is assigned the value 0.10,...
-
Derive Equations 3.44 and 3.45: \[ \begin{aligned} |G(i \omega)| & =\frac{1}{k \sqrt{\left(1-\left(\omega / \omega_{n} ight)^{2} ight)^{2}+\left(2 \zeta \omega / \omega_{n} ight)^{2}}} \\ \phi &...
-
Derive \(B_{1}\) and \(B_{2}\) in Equations 3.48 and 3.49: \[ \begin{aligned} & -\omega_{b}^{2} B_{1}+2 \zeta \omega_{n} \omega_{b} B_{2}+\omega_{n}^{2} B_{1}=A_{1} \\ & -\omega_{b}^{2} B_{2}-2 \zeta...
-
Plot \(F_{T} / k Y\), Equation 3.52, vs. \(\omega_{b} / \omega_{n}\) for \(\zeta=\) \(0.05,0.10\), and 0.25 . 1/2 kY =()[ 1+ (20wo/wn) - [(1 w/w) + (2(wo/wn) ] (3.52)
Study smarter with the SolutionInn App