Nonparental Care According to the Digest of Educational Statistics, a certain group of preschool children under the age of one year each spends an average of 30.9 hours per week in nonparental care. A study of state university center-based programs indicated that a random sample of 32 infants spent an average of 32.1 hours per week in their care. The standard deviation of the population is 3.6 hours. At a  0.01 is there sufficient evidence to conclude that the sample mean differs from the national mean?

Q: Students at a high school cut an average of 3.3 classes per month. A random sample of 125 seniors…

A: Null Hypothesis: H0: μ=3.3 Alternative Hypothesis: H1:μ>3.3 Given information:…

Q: A consumer group claims that the average annual consumption of high fructose corn syrup by a person…

A: Given information- Sample size, n = 33 Sample mean, x-bar = 53.5 pounds Sample standard deviation…

Q: Companies who design furniture for elementary school classrooms produce a variety of sizes for kids…

A: Given that, Mean = 39.2 Standard deviation = 1.9 Let X follows Normal distribution with mean 39.2…

Q: According to one study, the average hours of sleep on a weeknight for men was 6.9 hours with a…

A:

Q: Find the time it takes the fastest 24.2% of the college students to find a parking spot in the…

A: The length of time it takes college students to find a parking spot in the library parking lot…

Q: (a) Construct a 99.8% confidence interval for the difference in mean weight loss between the…

A: Let  be the population mean weight loss between the low-carb and low-fat diets.Given that,

Q: A​ half-century ago, the mean height of women in a particular country in their 20s was 63.8 inches.…

A: Given data,μ=63.8σ=2.51If n=28P(X≥65.08)=?

Q: Hospital waiting room times are normally distributed with a mean of 38.12 minutes and a standard…

A: From the provided information, Mean (µ) = 38.12 minutes Standard deviation (σ) = 8.63 minutes X~N…

Q: professor at a local university noted that the exam grades of her studer istributed with a mean of…

A: Given that.   X~N( μ , ?)   μ=68 , ?=17   Z-score =( x - μ )/?

Q: The hourly wages in a particular industry are normally distributed with mean $13.20 and standard…

A: The mean hourly wage is μ=$13.20, the standard deviation is σ=$2.5. Total number of worker n=40…

Q: Let u denote the actual population mean amount of mercury in tuna per ounce. The hypotheses for this…

A: Given : μ = 10.13 σ = 2.03

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

A:

Q: Entrance exam scores at Cititon University are normally distributed with a mean of 202 and a…

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: The average time taken for your Internet service provider to remotely resolve a trouble ticket has a…

A: It is provided that,Mean (µ) = 4.343Standard deviation (σ) = 3.131.

Q: The heights of a pediatricians three-year-old females are approximately normally distributed, with…

A:

Q: Help!!

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

Q: he amount of corn chips dispensed into a 32- ounce bag by the dispensing machine has been identified…

A: Given data ,μ = 32.5σ = 0.2p(x c x) = 0.67

Q: A company finds that for its 12 ounce cans of soda, the actual amount of soda inside is Normally…

A: Solution-: Given: μ=12,σ=0.25 We find x value such that P[X<x]=0.15

Q: The patient recovery time from a particular surgical procedure is normally distributed with a mean…

A: We have given that.    X~N( μ , ?^2 )    μ = 5.1      , ? = 1.8   Z-score =( x - μ )/?

Q: When students use the bus from their dorms, they have an average commute time of 9.463 minutes with…

A: Let X be the commute time for a random studentThe average commute time:  μ = 9.463 minutes   and…

Q: Mercury in Tuna - Mercury, if ingested can cause severe health problems. The amount of mercury in…

A: Any assumption about the parameter or probability function is called Hypothesis testing. There is…

Q: The average time taken for your Internet service provider to remotely resolve a trouble ticket has a…

A: Let X denote the time to remotely resolve a trouble ticket. Given that X follows N(mean = 4.3, SD =…

Q: Mercury in Tuna - Mercury, if ingested can cause severe health problems. The amount of mercury in…

A: Any assumption about the parameter or probability function is called hypothesis testing. There is…

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: Recently, the average price of a movie has been $7.90 in the U.S. It is known that ticket prices are…

A:

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: When students use the bus from their dorms, they have an average commute time of 8.832 minutes with…

A: Average Commute time of bus ,X= 8.832 minutes Standard deviation,σ = 4.2135 minutes and the commute…

Q: Mercury in Tuna - Mercury, if ingested can cause severe health problems. The amount of mercury in…

A: From the given information we find the probability type 1 error .

Q: In a recent study, the Center for Disease Control reported that diastolic blood pressure (in mmHg)…

A:

Q: In a drag race, the age of contestants are normallydistributed with a mean of 24 yrs and a standard…

A: X: age of contestantsX~N(μ,σ)where Mean(μ)=24 yrsand standard deviation(σ)=1.5 yrsfind…

Q: Mercury in Tuna ~ Mercury, if ingested can cause severe health problems. The amount of mercury in…

A: A hypothesis testing is used to draw conclusions about the population parameters. To conduct the…

Q: Watching TV: In 2012, the General Social Survey asked a sample of 1320 people how much time they…

A: From the provided information, Sample size (n) = 1320 Sample mean (x̄) = 2.85 Standard deviation (s)…

Q: A candy store sells about 8 million pieces of candy per day with a standard deviation of 300,000…

A: Given : Let X : Number candy that they sell in a given day           μ = 8 million i.e   Mean (μ) =…

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

A: For low carbohydrate n1 =sample size=40, sample mean x̄1=2.4, sample standard deviations s1=3.72…

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

A: Given:We have to construct a 98% confidence interval for the difference between population…

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

A: The given information is as follows,The sample mean is  The sample mean is The sample standard…

Q: Mercury in Tuna ~ Mercury, if ingested can cause severe health problems. The amount of mercury in…

A: P(Type I error) =P(rejection of null hypothesis when null hypothesis is true) =P(Rejection of H0 |…

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

A: The provided information is  x¯1=4.6s1=7.07n1=76x¯2=2.6s2=5.83n1=78α=0.01 Part 1 of…

Q: Mercury in Tuna ~ Mercury, if ingested can cause severe health problems. The amount of mercury in…

A: The hypothesized mean is 10.13.

Q: The heights of English men are normally distributed with a mean of 69.2 inches and a standard…

A: given mean  (μ= 69.2 )   standard deviation(σ)  = 4      z= (x-μ)/σ p(x<57.2) =P((x-μ)/σ  <…

Q: Draw the normal curve. Suppose that the amount of time it takes the Bureau of Internal Revenue…

A: Solution-: Given: μ=14,σ=1.5 We want to find x such that, P[X<x]=0.45

Q: · For 500 readers polled, how many people read in between 18 and 22 minutes a day? . For 25,000…

A:

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

A:

Q: you know the time it takes for college students to find a space in the parking lot near the library.…

A: Provided data is, the time taken for college students to find a space in the parking lot near the…