A laptop manufacturer claims that the mean life of the battery for a certain model laptop is less than 5 hours. Choose the correct null and alternative hypothesis.

Q: The parent association at a local high school believes that the amount of time spent on homework by…

A: Given: H0 : ? =30 Ha : ? >30 P-value = 0.0012

Q: It is believed that the average grade on an English essay in a particular school system for females…

A: we have given that  n1=12 , xbar1=82 ,s1=3 and n2=8 ,xbar2=76 ,s2=4  mu1=female   ,mu2=male

Q: If the mean lifetime is actually 31 years, what is the probability we will reject the null…

A: From the given information, n=42x¯=30.7s=3.2 Claim: The mean lifetime of the most commonly planted…

Q: Suppose it is known that the standard deviation of the weight of 10-ounce packages of cookies is…

A:

Q: How would a person set up the hypotheses if they wanted to test the claim: the mean height of a jump…

A: Claim : the mean height of a jump is less than 51 inches. The type I error is defined as the…

Q: Suppose the mean amount of cholesterol in eggs labeled “large” is 186  milligrams, with standard…

A: Given that  μ = 186 , ? = 7 , n = 144

Q: Three years ago the mean price of an existing single family home was 243,757. Determine the null and…

A: Ans: Three years ago the mean price of an existing single-family home was 243,757.         Determine…

Q: When you use the one-standard-deviation χ2-test or χ2-interval procedure, what assumption must be…

A: The assumption must be met by the variable under consideration when the one-standard-deviation…

Q: How would a person set up the hypotheses if the wanted to test the claim: the mean length of a…

A: Given : Claim : The mean length of a pyramid lake trout is greater than 21 inches.

Q: If the sample has standard deviation 2.1, what is a reasonable approximation to the range of this…

A: It is given that the standard deviation of the data is 2.1.

Q: A powder diet is tested on 49 people and a liquid diet is tested on 36 different people. The…

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Q: The value of the z-score in a hypothesis test is influenced by a variety of factors. Assuming that…

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Q: The parent association at a local high school believes that the amount of time spent on homework by…

A: From the provided information, The hypotheses are as follow: H0: µ = 30 Ha: µ > 30 The p value =…

Q: Previously, an organization reported that teenagers spent 4.5 hours per week, on average, on the…

A: Given Information :  Previously, an organization reported that teenagers spent 4.5 hours per week,…

Q: The director of a medical hospital feels that her surgeons perform fewer operations per year than…

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Q: Nationally, patients who go to the emergency room wait an average of 5 hours to be admitted into the…

A: From the provided information, Sample size (n) = 10 Sample mean (x̅) = 8 Standard deviation (s) = 3…

Q: A company claims that each bag of pretzels weighs 11.3 oz. A sample of 37 bags was weighed. The mean…

A: As the population standard deviation is not known, we will use a t-test. The null and alternative…

Q: The operation manager of a large production plant would like to estimate the average amount of time…

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Q: The mean time taken to learn the basics of a word processor by a group of students is 200 minutes…

A: Let, X= time taken to learn the basics of a word processor  Given that X follows a normal…

Q: Randomly selected students in a statistics class were asked to report the number of hours they slept…

A: Let the d be the differences between number of hours slept on weeknights and weekends. Given that…

Q: The Transportation Security Administration would like to compare the average amount of time it takes…

A: Note: Hi there! Thank you for posting the question. To avoid the plagiarism issue we have used the…

Q: A company that manufactures steel wires guarantees that the mean breaking strength (in kN) of the…

A: In statistical hypothesis testing, an error of type I is to rejecting the null hypothesis when it is…

Q: You are doing a right-tailed hypothesis test for the mean and have to approximate the standard…

A: It is given that the test is right-tailed. Level of significance is 0.01 Degrees of freedom is 39-1=…

Q: A manufacturer of a lightbulb claimed that its lightbulbs have a mean lifetime of 700 hours with a…

A: Given Mean=mu=700 Standard deviation=sigma=120 n=144

Q: A travel analyst claims that the mean of the room rates for two adults at three-star hotels in Salt…

A: When the population standard deviation is known (i.e., given σ = 30) one sample z-test is…

Q: A cereal company claims that the mean weight of the cereal in its packets is not 12 oz.  Identify…

A: It is given that the claim is that the mean weight of the cereal in its packets is not 12 oz.

Q: The head of maintenance at XYZ Rent-A-Car believes that the mean number of miles between services is…

A:

Q: A leasing firm claims that the mean number of miles driven annually, , in its leased cars is less…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: Suppose a recent report indicates that the mean height of girls between the ages of seven and nine…

A: Given: Population meanμ=131Sample size(n)=49 The claim is that the height is higher than 131 cm.

Q: a shareholders’ group, in lodging a protest, claimed that the mean tenure for a chief exective…

A: a. Here, the claim is that the mean tenure for a chief executive office (CEO) was at least nine…

Q: The administrator at your local hospital states that on weekends the average wait time for emergency…

A: The one sample t-test has four main assumptions: The dependent variable must be continuous…

Q: Three years ago, the mean price of an existing single-family home was $243,761. A real state broker…

A: Given H0: μ=243,761 H1: μ<243,761

Q: Suppose that a junior partner in a law firm in the Philippines earns an average of 150,000 pesos per…

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Q: If the variance of a national accounting examination is 900, how large a sample is needed to…

A:

Q: An online food delivery service in metro manila claims that the delivery time is not greater than 30…

A: Given :   Population SD (σ) = 3 Sample size (n) = 31 Sample mean (X¯) = 40 Level of significance (α)…

Q: A psychologist believes that it will take at least an hour for certain special child to learn a…

A: Given,sample size(n)=30sample mean(x¯)=50population standard deviation(σ)=15α=0.01

Q: There is a​ 5% chance that the mean reading speed of a random sample of 21second grade students will…

A:

Q: A somewhat outdated study indicates that the mean number of hours worked per week by software…

A: Hypothesized Mean = 44 Sample mean = 47 Standard deviation = 5   a) Hypothesis : Null : H0 : μ = 44…

Q: A researcher claims that the amounts of acetaminophen in a certain brand of cold tablets have a…

A: Given that the conclusion is fail to reject the null hypothesis.

Q: Three years ago, the mean price of an existing single-family home was $243,749. A real estate broker…

A:

Q: A somewhat outdated study indicates that the mean number of hours worked per week by software…

A: Statistical hypothesis testing is an important method in inferential statistics. It is used to test…

Q: Previously, an organization reported that teenagers spent 4.5 hours per week, on average, on the…

A: Here, Claim: Teenagers spent higher than 4.5                     hours per week,on average,on the…

Q: NebNas manages the credit department for a grocery store chain in the province, and she would like…

A: Given, The null hypothesis, H0:μ=95 The alternative hypothesis, H1:μ≠95 sample size, n=100 sample…

Q: If the F test leads us to reject the null hypothesis, we must then conclude that the two population…

A: We have given that,  If the F test leads us to reject null hypothesis, must then concluded that the…

Q: The school nurse thinks the average height of 10th graders have increased. The average height of a…

A: For the given data Perform Z test for one mean .

Q: calculate (formula /values) The test statistic and the associated P value range from the table…

A: Since you have posted a question with multiple sub-parts, we will solve first three sub-parts for…

Q: Consider two data sets from sampled populations, one with a high standard deviation and one with a…

A: HERE GIVEN TWO DIFFERENT DATA SET One has High standard deviation while second has low standard…

Q: For a random sample of 125 British entrepreneurs, the mean number of job changes was 1.91 and the…

A: The hypothesis test to compare the means can be conducted using the standard normal distribution and…

Q: A cigarette manufacturer claims that its brand of cigarette contains on the average 5mg of tar and…

A: Given : n=25 , X-bar=6  , s=2 , μ0=5  Assume that , α=0.05 Here , we want to test the cigarette…