Fast-Food Bills for Drive-Thru Customers A random sample of 47 cars in the drive-thru of a popular fast food restaurant revealed an average bill of $18.9 per car. The population standard deviation is $5.60. Estimate the mean bill for all cars from the drive-thru with 93% confidence. Round intermediate and final answers to two decimal places. 24 <µ< $

Q: Kindergarten Companies that design furniture for elementary school classrooms produce a variety of…

A: GivenMean(μ)=38.2standard deviation(σ)=1.8

Q: eighth grade​ students' scores on a national mathematics assessment test has a mean score of 293.…

A:

Q: Test the claim that the mean GPA of night students is smaller than the mean GPA of day students at…

A: Given Data : For Sample 1 x̄1 = 2.88 s1 = 0.06 n1 = 25 For Sample 2…

Q: Coca Cola distributes Coke in cans labeled 12 oz. The contents of 36 randomly selected cans are…

A: given information : μ = 12 ,x¯=12, σ=0.38 a) for given hypothesis H0:μ = 12  oz Ha: μ &lt; 12 oz.…

Q: A company claims that the mean monthly residential electricity consumption in a certain region is…

A:

Q: Fill in the blanks. The depth of the snow in my yard is normally distributed, with a mean of 2.5…

A: Let X: depth of snow in my yard Given that, X~N(2.5 , 0.252)

Q: Sodium čontent in one of its breakfast sandwiches is no more than 927 milligrams. A random sample of…

A: The claim is that the mean sodium content in one of its breakfast sandwiches is no more than 927…

Q: Arandom sample of 79 eighth grade students scores on a national mathematics assessment test has a…

A: Given: n= 79.0 ,x̄= 272.0 ,σ= 32.0 µ= 270.0 ,significance level(∝)= 0.11

Q: High School Competency Test A mandatory competency test for high school sophomores has a normal…

A: Given data, μ=440σ=82P(Z&gt;z)=7%=0.07z=?

Q: residential electricity consumption in a certain region is more than 860 ​kiloWatt-hours (kWh). You…

A:

Q: Weight Loss of Newborns An obstetrician read that a newborn baby loses on average 7 ounces in the…

A:

Q: random sample of 83 eighth grade students' scores on a national mathematics assessment test has a…

A: We have to test that if mean score is 275 or more

Q: SAT scores are distributed with a mean of 1,500 and a standard deviation of 294. You are interested…

A: We have given that,  Standard deviation = 294 , Margin of error = 50 , And we need sample size (n) =…

Q: Teachers’ Salaries A researcher is interested in estimating the average salary of teachers in a…

A:

Q: mpany that makes cola drinks states that the mean caffeine content per 12-ounce bottle of cola is 55…

A:

Q: Pay your bills: In a large sample of customer accounts, a utility company determined that the…

A: Given Data : Population Mean,μ = 31 Population Standard Deviation,σ = 5

Q: A random sample of 88 eighth grade​ students' scores on a national mathematics assessment test has a…

A: As per the policy I can solve only first three subparts for you. Please repost the remaining…

Q: A random sample of 76 eighth grade students' scores on a national mathematics assessment test has a…

A:

Q: random sample of 81 eighth grade​ students' scores on a national mathematics assessment test has a…

A: Given: Sample size (n) = 81 Sample mean x¯=290 Hypothesized mean μ= 285 Population standard…

Q: High School Competency Test A mandatory competency test for high school sophomores has a normal…

A:

Q: High School Competency Test A mandatory competency test for high school sophomores has a normal…

A:

Q: residential electricity consumption in a certain region is more than 860 ​kiloWatt-hours (kWh). You…

A:

Q: random sample of 76 eighth grade​ students' scores on a national mathematics assessment test has a…

A:

Q: 10. Heights of college women have a distribution that can be approximated by a normal curve with a…

A: It is given that heights of college women follow approximately normal distribution with mean 65…

Q: fitness magazine advertises that the mean monthly cost of joining a halth club is $25. you want to…

A: The hypothesis to test the claim that the mean monthly cost of joining a halth club is $25 or not…

Q: High School Competency Test A mandatory competency test for high school sophomores has a normal…

A: Given that.   X~N( μ , ?^2 )   μ=475    , ?=116   Z-score =( x - μ )/?

Q: A company claims that the mean monthly residential electricity consumption in a certain region is…

A: Claim : mean monthly residential electricity consumption in a certain region is more than 870…

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: 10. YouTube would like to test the hypothesis that the average length of an online video watched by…

A: 10. The provided information is x¯=6.6µ=6σ=1.7n=40α=40 The null and alternative hypothesis is…

Q: Guzzlers? Environmental Protection Agency (EPA) fueleconomy estimates for automobile models tested…

A:

Q: n the Oreo factory, the mean mass of a cookie is 40 grams with a quality control standard deviation…

A: In the Oreo factory, the mean mass of a cookie is 40 grams with a quality control standard deviation…

Q: A random sample of 89 eighth grade students' scores on a national mathematics assessment test has a…

A: b) Given information: μ=270x¯=273σ=36n=89

Q: In a paired samples t test, you calculate the standard deviation for the _______. 1 - population…

A: Paired sample t-test It is used, when two samples are dependent In this test, each entity is…

Q: A random sample of 87 eighth grade​ students' scores on a national mathematics assessment test has…

A:

Q: High School Competency Test A mandatory competency test for high school sophomores has a normal…

A: Given: μ=495 and σ=85.   From the given information,PZ&gt;z=7%⇒PZ&gt;z=0.07⇒1-PZ≤z=0.07⇒PZ≤z=0.93…

Q: A random sample of 86 eighth grade students' scores on a national mathematics assessment test has a…

A: Given n=86 x-bar=267 Standard deviations=30

Q: The Intelligence Quotient (IQ) test scores for adults are normally distributed with a population…

A: Solution-: Given: μ=100,σ=20,n=70 We want to find, P(the mean of sample less than 95)=?

Q: EPA fuel economy estimates for automobile models tested recently predicts a mean of 24 mpg and a…

A: Let "X" be the EPA fuel economy estimates for automobile models.

Q: The t score is

A: Given : mean score = 35   current average score = 40    standard deviation of distribution of means…

Q: A company claims that the mean monthly residential electricity consumption in a certain region is…

A:

Q: A company claims that the mean monthly residential electricity consumption in a certain region is…

A: According to the given information in this question We need to find critical value and conclusion

Q: A sample of 25 one-year-old girls had a mean weight of 24.1 pounds with a standard deviation of…

A: Let σ is the standard deviation of sheath thickness. Null hypothesis: H0: σ= 7 Alternative…

Q: Pay your bills: In a large sample of customer accounts, a utility company determined that the…

A:

Q: A random sample of 85 eighth grade students' scores on a national mathematics assessment test has a…

A:

Q: Debra attends a fashion institute that has no on-campus housing. The mean distance commuted to…

A: Given information Population mean µ = 16 km Standard deviation σ = 6 km We have given that the…

Q: Cat Behavior A report stated that the average number of times a cat returns to its food bowl during…

A: GivenMean(μ)=35standard deviation(σ)=4

Q: High School Competency Test A mandatory competency test for high school sophomores has a normal…

A: Here X~ N(460,114). We need to find x such that P(X&gt;x)=0.06

Q: A random sample of 75 eighth grade students' scores on a national mathematics assessment test has a…

A: