What Z score corresponds the 18th percentile?

Q: In a recent study on world​ happiness, participants were asked to evaluate their current lives on a…

A: The mean is 5.8 and the standard deviation is 2.4.

Q: In a recent study on world happiness, participants were asked to evaluate their current lives on a…

A:

Q: Sandra's marketing firm is advertising a new type of coffee for their client. As part of their…

A: The summary of the statistics is, The type of test is left tailed test

Q: For the United States, the mean monthly Internet bill is $32.79 per household ICNBC, January 18,…

A: Given that  Sample size n =50 sample mean =30.63 Population standard deviation =5.60

Q: Accoraing to the Census Bureau, 3.13 people reside in the typical American househola. A sample of 25…

A: Given ; sample Mean = x = 2.86 standard deviation = σ = 1.2 sample size = n = 25 Population mean =μ…

Q: How do I input the following into Excel? A United Nations report shows the mean family income for…

A: To test the claims made by United Nation and Farm Labor organizing committee , One Sample t test can…

Q: A developmental psychologist studies moral awareness in male and female adolescents. Previous…

A: Given information- Population mean, μ = 72 Population standard deviation, σ = 18 Sample size, n = 58…

Q: Russell is doing some research before buying his first house. He is looking at two different areas…

A: Formula : CI=(x̄1 - x̄2) ± ME

Q: John scored 60 in a quiz in Math for which the average score of the class was 50 with a standard…

A:

Q: What is the average score for those who are confident about asking questions they don't understand…

A: The bar graph is provided for those who are confident about asking questions they don’t understand…

Q: It says on the new Meat Man Barbecue's box that it takes 10 minutes for assembly. The manager of the…

A:

Q: For the United States, the mean monthly Internet bill is $32.79 per household (CNBC,  January 18,…

A: Given  μ=32.79 n=50, x̄=30.63, σ=5.60

Q: 3. In the population, the average IQ is 100 with a standard deviation of 15. A team of scientist…

A: To test, Null hypothesis: New medication has no effect on intelligence.  Alternate hypothesis: New…

Q: Students in two basic Spanish classes were required to learn 50 new vocabulary words. One group of…

A: Given, Students in two basic Spanish classes were required to learn 50 new vocabulary words. One…

Q: Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout.…

A: Givenaverage length of trout caught in Pyramid Lake is μ = 20 inches.Sample size = 37sample mean =…

Q: The SAT and ACT are standardized tests for college admission in the United States. Both tests…

A: Percentile of Sam's score is given by the cumulative probability of observing a score of at least…

Q: In a recent study on world​ happiness, participants were asked to evaluate their current lives on a…

A: Given : μ = 5.8σ = 2.4

Q: In a recent study on world happiness, participants were asked to evaluate their current lives on a…

A:

Q: Placement exams An incoming freshman took hercollege’s placement exams in French and mathematics.In…

A: In French exam, the freshman scored 82 and in Math exam she scored 86. The mean score for French is…

Q: The manufacturer claims that your new car gets 27 mpg on the highway. You suspect that the mpg is…

A: Since sample size is large but population sd is unknown , we will be utilising t distribution for…

Q: An editor wants to estimate average the number of pages in bestselling novels, so that his estimate…

A: Note: Since you have posted a question with multiple subparts, we will solve the first three…

Q: Which is cheaper: eating out or dining in? The mean cost of a flank steak, broccoli, and rice bought…

A: From the given information, Sample size n =100 Sample mean, x̅=$12.65 Sample standard deviation,…

Q: In a recent study on world happiness, participants were asked to evaluate their current lives on a…

A: Since the given measured score of happiness is obtained from the population, hence the measured…

Q: C2. You are asked to do a study of shelters for abused and battered women to determine the necessary…

A: Given information: μ=250, σ=75 a)  x = 350 By applying normal distribution:- z=x-μσ=350-25075=1.3333…

Q: The brand of corn flakes come in a box that says it holds 32 ounces of cereal. The manufacturer says…

A: Note- As per our policy we can answer only the first 3 sub-parts of a question. If you want…

Q: Question Help ▼ In a certain city, the average 20- to 29-year old man is 69.8 inches tall, with a…

A:

Q: 7. A student received a score of 55 on a history test for which the class mean was 65 with a…

A: * SOLUTION :-  (7)   From the given information the calculation is provided below

Q: b. An insurance company would like to determine how long people remain hospitalized after a routine…

A: The mean, median and mode are generally rigidly defined. Only the mean directly uses all the…

Q: Quikly support which is cheaper: eating out or dining in? The mean cost of a flank steak, broccoli…

A: The null and the alternative hypotheses used for testing are,

Q: The Bureau of Elections in a county samples the voting records by party. It finds that the Yellow…

A:

Q: participants were asked to evaluate their current lives on a scale from 0 to​ 10, where 0 represents…

A: We want to find the value for given data

Q: Which is cheaper: eating out or dining in? The mean cost of a flank šteak, broccoli, and rice bought…

A: (a)   State the hypotheses.

Q: a) What response represents the 90th ​percentile? ​(b) What response represents the 62nd…

A: In a recent study on world​ happiness, participants were asked to evaluate their current lives on a…

Q: In a recent study on world​ happiness, participants were asked to evaluate their current lives on a…

A: Let the random variable X denotes the responses of participants who were asked to evaluate their…

Q: Many firms use on-the-job training to teach their employees computer programming. Suppose you work…

A: It is provided that, many firms use on-the-job training to teach their employees computer…

Q: Which is cheaper: eating out or dining in? The mean cost of a flank steak, broccoli, and rice bought…

A: Given,sample size (n)=100sample mean(x¯)=12.70standard deviation(s)=2H0:μ≥13.04H1:μ<13.04

Q: Many people now turn to the internet to get information on health-related topics. A research article…

A: Given: Wikipedia: Mean = 26.5, Standard deviation = 14.5, n1 = 40 WebMD : Mean = 43.5, Standard…

Q: burban Families Watched An Average Of μ = 60 Minutes Of Television Each Day. Assuming That The…

A: Given dataMean µ = 60 minStandard deviation σ = 25 minutesa) proportion of 2-year-old children watch…

Q: In a recent study on world happiness, participants were asked to evaluate their current lives on a…

A:

Q: Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout.…

A:

Q: A highly anticipated sci-fi movie opened in theaters with a special midnight showing this past…

A: given;x=230mean(μ)=250standard deviation(σ)=14find z-score=?

Q: What is the test statistic for this test?

A: The population mean is $50,000, sample size is 100, sample mean is $50,250, and sample standard…

Q: For the United States, the mean monthly Internet bill is $32.79 per household (CNBC, January 18,…

A: Given: μ=32.79σ=5.60x¯=30.63n=50 a) Hypothesis: Null hypothesis: H0: μ=32.79Alternative hypothesis:…

Q: Pyramid Lake is on the Paiute Indian Reservation in Nevada. The lake is famous for cutthroat trout.…

A: Given information Hypothesized mean µ = 19 inches Sample size (n) = 49 Mean x̅  = 18.5 inches…

Q: A highly anticipated scl-fl movie opened in theaters with a special midnight showing this past…

A:

Q: In a certain microwave oven on the high power setting. the time it takes a randomly chosen kernel of…

A: “Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: (a) What response represents the 90th ​percentile? ​(b) What response represents the 63rd…

A: Let , X→N(μ=5.4 , σ=2.1) Our aim is to find the following :  (a) 90th percentile (b) 63rd…

Q: In a recent study on world​ happiness, participants were asked to evaluate their current lives on a…

A: Solution To find percentile we will use percentile in excel.

Q: Rashid is 84 inches tall. If the height of males in the United States is normally distributed with a…

A: Given :                data point = 84                 mean = 70                standard deviation…

Q: The Medical Rehabilitation Education Foundation reports that the average cost of rehabilitation for…

A:

Confidence Intervals

When we calculate intervals in probability and statistics, it can be simply termed as finding out a confidence interval. The confidence interval is usually calculated from the data set which is observed. The value of the parameter that needs to be calculated is present here only.