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?

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A:

Q: Refer to the Current Allergy & Clinical Immunology (March 2004) study of allergic reactions of…

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Q: UNDERGRADUATE SCHOOL EXPENSES Average college cost of tuition fee for all private institutions last…

A: From the provided information, Sample size (n) = 45 Sample mean (x̅) = 27690 Sample standard…

Q: A math teacher claims that she has developed a review course that increases the scores of students…

A: Hypothesis testing is a way to test a claim about a population parameter.

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A: Let population 1: children borns to cocaine users. population2: children borns to cocaine no-users.…

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A: Given that: Mean =$ 127000 S. D = $ 10100 X represent salary of assistant professor. And x follow…

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A:

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A: Given: The meat-packing department of a large grocery store packs ground beef in two-pound portions.…

Q: The average cost for teeth straightening with metal braces is approximately $5400. A nationwide…

A: The Null hypothesis H0: μ = 5400. Alternative hypothesis Ha: μ <5400 Here, α =0.025 Since…

Q: A school has 1000 students. The principal of the school thinks that the average IQ of its students…

A: Given: Sample size(n)=200Sample meanx¯=108Sample standard deviation(s)=10

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A: According to central limit theorem, for large sample (>30) or if the population follows normal…

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A: 20. Hey, since there are multiple subparts posted, we will answer first three question. If you want…

Q: A car dealership owner claims that the average price of the cars on his lot is less than $10800. You…

A: Denote μ as the average price of all of the cars on owner’s lot.

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A:

Q: Bon Air Elementary School has 1000 students. The principal of the school thinks that the average IQ…

A: Introduction: Denote μ as the true mean IQ score of the students. As the principal believes the…

Q: Do male and female servers at Swank Bar work the same number of hours? A sample of 75 female servers…

A: We have given that  Sample sizes n1=75     , n2=75      Sample means X̄1=35      , X̄2=36…

Q: Average Senior High School annual cost of tuition fee for all private schools last year was P46,300.…

A: Given data : n =45  x̄ = 47800 s= 5600 μ= 46300

Q: was made to estimate the difference in salaries of college professors in the private and state…

A: hypothesis to be tested  H0 : μ1-μ2=500H1 : μ1-μ2 <500 here μ1= mean of private college…

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A:

Q: Amstat News (December 2004) lists median salaries for associate professors of statistics at research…

A: Given: n 1= 200 x1 bar = $70,750  s 1=  $6000. n 2 = 200 x2 bar = $65,200 s 2 = $5000.

Q: An experiment is conducted to determine whether intensive tutoring (covering a great deal of…

A: State the hypotheses. That is, there is no evidence that the intensive tutoring is more effective…

Q: Do male and female servers at Swank Bar work the same number of hours? A sample of 50 female servers…

A:

Q: A consumer advocate analyzes the nicotine content in two brands of cigarettes. A sample of 20…

A: Confidence Interval: In statistics, we can say a range of values of the specified population…

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A:

Q: A medical researcher is interested in the prenatal care received by pregnant women in inner cities.…

A: We have given that  Sample size n=20 , sample mean =4  s=1 , 95%confidence.

Q: At the 0.10 level of significance, can it be concluded that this represents a difference from the…

A: Given that Sample size n = 50 Sample mean = 9.2 Population SD = 3.2 Level of significance = 0.10

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A: Null and alternative hypotheses:Let σ is the standard deviation of machine dispenses amount.Null…

Q: 1. Commuter students at a certain college claim that the average distance they have to commute to…

A: Since the sample size is small, it is appropriate use one sample t-test. Here, the sample mean,…

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A: (a)

Q: Antelope Coffee, Inc., is considering the possibility of opening a gourmet coffee shop in Big Rock,…

A: mean = μ = 70000 standard deviation = σ = 5000

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Q: A company is offering 401k matching for its employees who stay with the company for more than 10…

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Q: A study investigating the relationship between age and annual medical expenses randomly samples…

A: Obtain the z-value corresponds to the probability that the mean age of the individuals sampled is…

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Q: A parent interest group is looking at whether birth order affects scores on the ACT test. It was…

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Q: One-Way Airfares The average one-way airfare from Pittsburgh to Washington D.C. is $236. A random…

A: According to the provided information, The hypothesis can be defined as:

Q: A math teacher claims that she has developed a review course that increases the scores of students…

A:

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A: From the given information, The average value is lower than 120 bpm. Null Hypothesis: H0: The…

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A:

Q: Do male and female servers at Swank Bar work the same number of hours? A sample of 65 female servers…

A: Given, Sample size of females n1 = 65Sample mean of females x1¯ = 37Standard deviation of females s1…

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A: Here the population standard deviation is not known and we are supposed to test a value of the mean…

Q: The Environmental Protection Agency (EPA) fuel economy estimates for automobile models tested…

A: From the provided information, Mean (µ) = 27.8 Standard deviation (σ) = 4.2 X~N (27.8, 4.2)

Q: 28. Hotel Room Rates A travel analyst claims that the standard deviation of the room rates for two…

A: Given: The sample number of three star hotels is n=18. The sample standard deviation is s=$40. The…

Q: The average "moviegoer" sees 8.5 movies a year. A moviegoer is defined as a person who sees at least…

A: Given Average =9.9 Sample SD=3.2 n=42 μ=8.5

Q: An experiment is conducted to determine whether intensive tutoring (covering a great deal of…

A:

Q: An automated machine dispenses milkshakes into large-size cups at a local fast food chain. The…

A: Solution

Q: A college entrance exam company determined that curriculum of math courses in high school. Suppose a…

A: Given data : sample size, n = 250 sample mean, x̄ = 21.4 sample standard…