A used car dealer says that the mean price of a​ three-year-old sports utility vehicle is ​$21,000. You suspect this claim is incorrect and find that a random sample of 22 similar vehicles has a mean price of ​$21,753 and a standard deviation of ​$1920. Is there enough evidence to reject the claim at α=0.05​? find standardized test stat, p value, critical values

Q: An aim of this study was to evaluate if there is a difference after the GFCF (gluten-free,…

A: Given that: Mean of paired difference, d¯=1 Standard deviation of paired difference, sd=3…

Q: In a test of the effectiveness of garlic for lowering​ cholesterol, 49 subjects were treated with…

A:

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.47 and a…

A: Empirical rule: The probability that the observation under the normal curve lies within 1 standard…

Q: well-known brand of pain relief tablets is advertised to begin relief within 24 hours. A simple…

A: Solution: Given information: n=18 Sample size x=24.8 hours Sample mean μ=24 hours Population mean s=…

Q: In a test of the effectiveness of garlic for lowering​ cholesterol, 81 subjects were treated with…

A:

Q: 0 mg/dL H₁: #0 mg/dL OA. Ho: OC. Ho: μ = 0 mg/dL H₁: >0 mg/dL Determine the test statistic. (Round…

A:

Q: Low-fat or low-carb? Are low-fat diets or low-carb diets more effective for weight loss? A sample of…

A:

Q: The number of chocolate chips in a popular brand of cookie is normally distributed with a mean of 23…

A: Let, x denotes the number of chocolate chips.It is given that x is normally distributed with…

Q: In a test of the effectiveness of garlic for lowering cholesterol, 49 subjects were treated with raw…

A:

Q: The weights of weekly plastic waste from a random sample of 50 American households resulted in a…

A: Given,sample size(n)=50sample mean(x¯)=1.91standard deviation(σ)=1.07α=0.05H0:μ=1.8H1:μ>1.8

Q: 4. Dunlop Company conducts tests on tires life. For a particular tires, the standard deviation is…

A: Given, Standard deviation is 6000 68% confidence interval is (102,000, 78,000). For a normal…

Q: Is a weight loss program based on exercise more effective than a program based on diet? The 57…

A:

Q: Help!!

A: (a) Given: μ=374, σ=64, n=5 The corresponding z-value needed to be computed is: The probability…

Q: 2 An article reported the results of a study to determine whether treadmill exercise could improve…

A: To determine whether the mean distance walked for patients using a treadmill is greater than the…

Q: Suppose that an advertisement claims the average weight loss for someone on a new fad diet is 15…

A: Given, Sample size = 18 Sample mean = 15.83 Population standard deviation = 4   Under the claim, the…

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.11 and a…

A: Given that the shoe sizes of American women have a bell-shaped distribution with a mean of 8.11 and…

Q: A company claims that, the mean battery life of their cell phone is at least 5 hours and standard…

A: Given,sample size(n)=25sample mean(x¯)=4.8standard deviation(σ)=0.5α=0.04H0:μ<5H1:μ≥5

Q: The number of chocolate chips in a popular brand of cookie is normally distributed with a mean of 21…

A: Given data in the problem is Mean=21 SD=1.4 90% means --->5% top and…

Q: Do people who exercise regularly have a cholesterol level less than the recommended level of 140? A…

A: The summary of statistics is,

Q: Students took a college math placement exam with a mean of 200 and a standard deviation of 12. Using…

A: Given that, μ=200σ=12

Q: In a test of the effectiveness of garlic for lowering cholesterol, 64 subjects were treated with raw…

A:

Q: In a test of the effectiveness of garlic for lowering cholesterol, 50 subjects were treated with…

A:

Q: ppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.42 and a…

A: Given data,Mean μ=8.42sd    σ=1.52P(6.9<X<9.94)=?

Q: The weight gains of animals during a period of confinement follow a normal distribution of mean 39.0…

A: A continuous random variable X is said to follow Normal distribution with parameters μ and σ2 if its…

Q: Suppose Abby tracks her travel time to work for 60 days and determines that her mean travel time, in…

A: The random variable X is defined as the travel time. The travel time at least 26.11% of the 60 days…

Q: n a test of the effectiveness of garlic for lowering​cholesterol, 49 subjects were treated with raw…

A:

Q: A manufacturer of electrical products will not accept a shipment of parts from a vendor if there is…

A: Given that  Hypothesized Population Mean (\mu)(μ) = 100 Sample Standard Deviation (s)(s) =…

Q: restaurant association says the typical household in the United States spends a mean amount of $3095…

A: Given that Clam : The typical household in the United States spends a mean amount of $3095 per year…

Q: In a test of the effectiveness of garlic for lowering cholesterol, 49 subjects were treated with raw…

A: Method: Using One sample t test

Q: An economist studying fuel costs had a suspicion that the median price of gasoline in his state was…

A: Given  x¯=3.04s=0.39α=0.01 test statistic=0.65 p-value =0.260

Q: Are severe psychiatric disorders related to biological factors that can be physically observed? One…

A: Solution: Given information: n1=10 Sample size of patients with obsessivecompulsive disordersn2=10…

Q: The number of chocolate chips in a popular brand of cookie is normally distributed with a mean of 22…

A: given data  normal distribution μ = 22 chocolate chips per cookieσ = 3.1 chocolate chips per cookie…

Q: r feels that the mean hospital stay in 2002 should be less due to initiatives aimed at reducing…

A: We are given: μ=Population mean=7.1x¯=Sample mean=6.85s=Sample standard devitaion=7.01n=Sample…

Q: a program based on diet? The 54 overweight people put on a strict one year exercise program lost an…

A: Given that    Sample sizes n1=54    , n2=47     Sample means X̄1=27     , X̄2=29        s1 =5…

Q: 2. An electrical firm manufactures light bulbs that have a lifetime that is approximately normally…

A: Result Fail to reject null hypothesis We say that there is not statistically significant.

Q: The average American consumes 82 liters of alcohol per year. Does the average college student…

A: Given,sample size(n)=15sample mean(x¯)=73.1standard deviation(s)=15degrees of…

Q: s = $7.61. At 1% significance level, do the data provide sufficient evidence to conclude that this…

A: HERE GIVEN, A company collects information about retail prices of history books. During the year…

Q: The number of chocolate chips in a popular brand of cookie is normally distributed with a mean of 19…

A: Z = x-μσ~N(0,1)

Q: Students took a college math placement exam with a mean of 200 and a standard deviation of 12. Using…

A:

Q: A real estate sales agency, specializes in selling farm houses. Its records indicate that the mean…

A:

Q: A researcher wishes to see if the mean number of days that a basic, low price, small automobile sits…

A: The random variable X follows normal distribution. We have to find the test value. This is one…

Q: Assume weights of adult males in the US are approximately normally distributed with a mean of 195…

A: Given that: Population mean, μ=195 Population standard deviation, σ=30

Q: In a test of the effectiveness of garlic for lowering​ cholesterol, 36 subjects were treated with…

A: State the hypotheses. That is, there is no evidence that with the garlic treatment, the mean change…