Hypothesis test to examine the possibility

Reference no: EM13995598

Before accepting a large shipment of bolts, the director of an elevator construction project checks the tensile strength of a simple random sample consisting of 20 bolts. She is concerned that the bolts may be counterfeits, which bear the proper markings for this grade of bolt, but are made from inferior materials. For this application, the genuine bolts are known to have a tensile strength that is normally distributed with a mean of 1400 pounds and a standard deviation of 30 pounds. The mean tensile strength for the bolts tested is 1385 pounds. Formulate and carry out a hypothesis test to examine the possibility that the bolts in the shipment might not be genuine.

Reference no: EM13995598

Questions Cloud

Derive an expression that gives the current in the loop : The total resistance of the loop is R. Derive an expression that gives the current in the loop at the instant the near side is a distance r from the wire.

Superintendent complaint justified : The superintendent of a large office complex, upon evaluating 30 of the units recently purchased and finding their mean power consumption to be 805 watts, claims that her shipment does not meet company specifica- tions. At the 0.05 level of signif..

Hypothesis test and a level of significance : Using a nondirectional hypothesis test and a level of significance of your choice, what conclusion would be reached? For the significance level used in part (a), construct the appropriate confidence interval and verify the conclusion reached in par..

What is the period of the beat : Two cellos are being played in a duet. At a certain point, one cello plays a note of frequency 148.0 Hz and the other plays a note of frequency 148.5 Hz. What is the period of the beat?

Hypothesis test to examine the possibility : The mean tensile strength for the bolts tested is 1385 pounds. Formulate and carry out a hypothesis test to examine the possibility that the bolts in the shipment might not be genuine.

Elements from the bloodstream : Strands of human hair absorb elements from the bloodstream and provide a historical record of both health and the use or nonuse of chemical substances. Hair grows at the rate of about one-half inch per month, and a person with long hair might be..

How many uranium atoms are there in four g of pure uranium : The speed of light in vacuum is 186000 mi/s = 3.0E+8 m/s. The mass of one uranium atom is 4.0 10-26 kg. How many uranium atoms are there in 4 g of pure uranium?

Campaign for reelection : In a speech during her campaign for reelection, a Republican candidate claims that 55% of regis- tered Democrats in her county intend to vote for her.

What are the annual inventory holding costs : The Burdell Company is a small manufacturing company that uses gear assemblies to produce four different models of mountain bikes. Use the information in Scenario. What are the annual inventory holding costs if Burdell orders using the EOQ quantity

User Account

All Pages