According to a​ report, the standard deviation of monthly cell phone bills was ​$5.74 three years ago. A researcher suspects that the standard deviation of monthly cell phone bills is less today. Determine the null and alternative hypotheses. Determine the correct hypotheses.   H0​: ▼       equals= less than< greater than> not equals≠ ​$5.74 H1​: ▼

Q: Suppose you know the population average wage in the manufacturing industry in the U.S. is $26.72 per…

A: Type II error = P( Fail to reject Ho| When mu = 25)

Q: A veterinarian took 10 glucose readings from a horse. Sample mean is 93.8, s = 3.5; the mean glucose…

A: The question is about hypo. testing Given : No. of glucose readings ( n ) = 10 Sample mean of…

Q: Consider a value to be significantly low if its z score less than or equal to -2 or consider a value…

A: Given: Mean μ=19.8 Standard deviation σ=5.2 If  z≤-2, lowz≥2, high

Q: Consider a value to be significantly low if its z score less than or equal to - 2 or consider a…

A: The formula of z score is: z=x-uσ The values less than or equal to -2 can be considered as…

Q: In a national survey, middle school students report spending 3.1 hours per week on homework. Mr.…

A: μ=3.1n=24α=0.1σ=1.9x=3.4

Q: The claim that statistics consultants have mean income of $90,000 is to be tested at a=0.05. A…

A: Solution Here we want to test that statistics consultants have mean income of $90,000 is to be…

Q: minutes to wash a car with a standard deviation of 5 minutes.   I'm offered a job where I'm paid $5…

A:

Q: In a calculus class, Jack Hartig scored 8 on a quiz for which the class mean and standard deviation…

A: we have to find  which student did better...

Q: A student score 83 on a Mathematics in the Modern World has a mean of 72 and a standard deviation of…

A:

Q: In the past, the value of houses a local realtor has sold is normally distributed with a mean of…

A: We have to find given score.

Q: The standard deviation of the number of words in a sentence by students is 3 words. It is believed…

A:

Q: Alpha LLC recently had its customers rate customer service on a scale of 1 to 10 (with 10 being…

A: Given information: Alpha LLC recently had its customers rate customer service on a scale of 1 to 10.…

Q: The 2018 Math Portion of the SAT score are normally distributed with a mean of 527 and a standard…

A: Empirical Rule: If a population has bell shaped distribution with mean µ and standard deviation σ ;…

Q: Suppose you know the population average wage in the manufacturing industry in the U.S. is $26.72 per…

A: true mean value = 25 mu = 26.72 s = 2.6

Q: eenage boys often complain that auto insurance costs more, on average, for teenage boys than for…

A: Given, Parents of teenage boys often complain that auto insurance costs more, on average, for…

Q: HUgo averages 29 home runs per season with a standard deviation of 2.4. Jacob averages 33 home runs…

A:

Q: According to a local newspaper, students at a local university usually take 4.5 years to graduate. A…

A: 1) Here the parameter is that average number of years required to graduate. Thus, μ=4.5 Claim: A…

Q: Suppose that the antenna lengths of woodlice are approximately normally distributed with a mean of…

A: we have to find given probability..

Q: A popular fashion magazine claims that the age of their subscribers is normally distributed with a…

A:

Q: Three years​ ago, the mean price of a​ single-family home was ​$243,741. A real estate broker…

A: We want to tell you, which one is the correct choice.

Q: A researcher wants to know if high school students spend a different amount of time watching netflix…

A: Given that  On average, people in general watch Netflix for 71 mins, with a standard deviation of 5…

Q: assigns a value to a number based on how many standard deviations it stands from the mean and is an…

A: Z-score: It is also called a standard score. It estimates how far a data point is from the mean of a…

Q: Do men take a different amount of time than women to get out of bed in the morning? The 54 men…

A: Given Information: Men: Sample size n1=54 Sample mean x¯1=4.3 Standard deviation s1=1.4 Women:…

Q: Do men take a different amount of time than women to get out of bed in the morning? The 51 men…

A:

Q: A random sample of 43 cars in the drive-thru of a popular fast food restaurant revealed an average…

A: Given that mean=16.87

Q: The average IQ of a population is 100. A researcher wants to test whether a new medicine 'Think…

A:

Q: A sociologist claims that mean height of all adult women in Smallville is more than 64 inches. In a…

A: Given data is appropriate for testing of hypothesis for testing z-test for single mean. Because it…

Q: Parents of teenage boys often complain that auto insurance costs more, on average, for teenage boys…

A:

Q: The average chef at a restaurant earns $17 an hour with a deviation of $1.75. What are the chances…

A:

Q: In 2002, the mean age of an inmate on death-row was 40.7 years, according to data from the US…

A:

Q: The yearly price of gasoline has change. The mean mileage for this year is 10000 km. Motorists have…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: A radio station claims that the amount of advertising each hour has a mean of 17 minutes and a…

A:

Q: Say that an extraversion scale has a population mean of 40 and a standard deviation of 10. About…

A:

Q: Q1:The average chef at a restaurant earns $17 an hour with a deviation of $1.75. What are the…

A: Since you have asked multiple questions, we will solve the first question for you. If you want any…

Q: Consider a value to be significantly low if its z score less than or equal to -2 or consider a value…

A:

Q: The standard deviation of quiz scores in Math 22 of EE courses is 8.6. A professor believes this…

A: The provided information is n=20 σ=8.6 s=6.9 The level of significance is  α=0.05 The null and…

Q: in a test of a lifelong brand of tires , a survey revealed that the mean life was 35,000 mikes and…

A: Let the random variable X be the life of tires.  The random variable X follows Normal distribution…

Q: A test is used to assess readiness for college. In a recent​ year, the mean test score was 19.2 and…

A: Given data: Mean test score, μ=19.2. Standard deviation, σ=4.5. A value is considered to be…

Q: Consider a value to be significantly low if its z score less than or equal to −2 or consider a value…

A: Given that Mean, mu= 21.4 Standard deviation, sigma= 5.4 Z score is given by, Z= (X-mu)/sigma

Q: An exam score has a mean of 78 and a standard deviation of 9. What is the Z-score for an exam score…

A: GivenMean(μ)=78standard deviation(σ)=9

Q: An IQ test has a mean of 96 and a standard deviation of 15. Which is more​ unusual, an IQ of 81 or…

A: The Higher z score value will be more unusual The formula of z score is give by…

Q: Student loan debt is the only form of consumer debt that has grown since the peak of consumer debt…

A: We have given that.    X~N( μ , ?^2 )    μ =24350     , ? = 3000   ,n= 30   Z-score =( x - μ )/?