What is the null hypothesis and alternative hypothesis?
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A: Note: According to Bartleby guidelines expert solve only one question and rest can be reposted.
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A: Solution-: Given: μ=3.82,σ=0.72,n=36 Here, Lower Limit=1.16, Upper Limit=5.98
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A: Given that, A population distribution has a normal distribution with μ= 360 and σ= 102. A random s...
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What is the null hypothesis and alternative hypothesis?
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- A research center claims that more than 21% of employees in a certain country have changed jobs in the past four years. In a random sample of 280 people from that country, 70 have changed jobs in the past four years. At α=0.01, is there enough evidence to support the center's claim? Complete parts (a) through (e) below. (a) Identify the claim and state H0 and Ha. Identify the claim in this scenario. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do not round.) A. The percentage of employees in the country who have changed jobs in the past four years is not nothing%. B. nothing% of employees in the country have changed jobs in the past four years. C. At most nothing% of employees in the country have changed jobs in the past four years. D. More than nothing% of employees in the country have changed jobs in the past four years. Let p be the population…A research center claims that more than 29% of employees in a certain country have changed jobs in the past three years. In a random sample of 220 people from thatcountry, 77 have changed jobs in the past three years. At α=0.05, is there enough evidence to support the center's claim? Complete parts (a) through (e) below. (a) Identify the claim and state H0 and Ha. Identify the claim in this scenario. Select the correct choice below and fill in the answer box to complete your choice. (Type an integer or a decimal. Do not round.) A. ______% of employees in the country have changed jobs in the past three years. B. The percentage of employees in the country who have changed jobs in the past three years is not ______%. C. At most ______% of employees in the country have changed jobs in the past three years. D. More than ______% of employees in the country have changed jobs in the past three years. (b) Find the critical value(s) and identify the rejection region(s). (c) Find…When dragons on planet Pern lay eggs, the eggs are either green or yellow. The biologists have observed over the years that 28% of the eggs are yellow, and the rest green. Next spring the lead scientist has permission to randomly select 56 of the dragon eggs to incubate. Consider all the possible samples of 56 dragon eggs.What is the usual number of yellow eggs in samples of 56 eggs? (Give answers as SENSIBLE whole numbers. In other words, make sure the whole number is within the range of usual values.)minimum usual number of yellow eggs = maximum usual number of yellow eggs =
- A researcher studies the effects of guilt on memory. First, subjects perform a very boring task for one hour. Then each subject is instructed to tell the next subject either (a) that the experiment took one hour and they found it very boring, or (b) that the experiment took one hour and was very interesting. After that, each subject is asked to study a list of words and are tested on memory for the list. 30 subjects are randomly assigned to one of the two conditions. In order to see whether the experimental manipulation has any effect on memory, which would be the proper statistical test? A)a related sample t-test-test B)an independent sample t-test C)a z test D)a one sample tIn a certain color test, 100 words that are color names are shown in colors different from the word. For example, the word red might be displayed in blue. The task is to correctly identify the display color of each word; in the example just given the correct response would be blue. Organizers recorded the time needed to complete this test for n = 16 individuals after they had consumed alcohol and for n = 16 other individuals after they had consumed a placebo drink flavored to taste as if it contained alcohol. Each group included eight men and eight women. In the alcohol group, the mean completion time was 135.25 seconds and the standard deviation was 22.64 seconds. In the placebo group, the mean completion time was 112.92 seconds and the standard deviation was 12.04 seconds. (a) Calculate the unpooled standard error for the difference in the two sample means. (Round your answer to four decimal places.)(b) Calculate a 95% confidence interval for the difference in population means. For…A researcher investigating a new product for clearing up acne selects a random sample of 13teenagers, and measures the amount of acnes they have. Afterwards, the researcher gives theparticipantsthe facial product to use, and asks that they report backafter 15 days of use. At theend, the researcher measures the acne numbers again and records the difference(after use minusbefore use).The results (in counts) aregiven below. Xi: -20, 8, 6, -14, -15, -14, 0, 1, 3, -7, -15,-4, 9 a.Identify the predictor and predicted variables. b.Determine if the studyisexperimental or non-experimental, explain why. c.Describe the levels of measurement for the variables, explain why. d.Report on the central tendencyby calculating the mean, median, mode. e.Report on the variabilityby calculating therange, variance, and standard deviation. f.Report on the kurtosis and skewness of the data.
- A researcher investigating a new product for clearing up acne selects a random sample of 13teenagers, and measures the amount of acnes they have. Afterwards, the researcher gives theparticipantsthe facial product to use, and asks that they report backafter 15 days of use. At theend, the researcher measures the acne numbers again and records the difference(after use minusbefore use).The results (in counts) aregiven below. Xi: -20, 8, 6, -14, -15, -14, 0, 1, 3, -7, -15,-4, 9 d.Report on the central tendencyby calculating the mean, median, mode. e.Report on the variabilityby calculating therange, variance, and standard deviation. f.Report on the kurtosis and skewness of the data.Suppose we observe 84 alcoholics with cirrhosis of theliver, of whom 29 have hepatomas—that is, liver-cell carcinoma.Suppose we know, based on a large sample, that therisk of hepatoma among alcoholics without cirrhosis of theliver is 24%. 5.52 What is the smallest number of hepatomas that wouldhave to be observed among the alcoholics with cirrhosis ofthe liver for the hepatoma experience in this group to differfrom the hepatoma experience among alcoholics withoutcirrhosis of the liver? (Hint: Use a 5% probability of gettinga result at least as extreme to denote differences betweenthe hepatoma experiences of the two groups.)Before the Mayweather vs Pacquiao's Fight of the centure, 75% of the people in Manila said that they preferred boxing over basketball. After the fight, out of the 150 randomly, chosen people in Manila, 150 said they preffere boxing over basketball. Does this indicate that people in Manila are losing interest in boxing? Use 0.05 level of significance.
- When dragons on planet Pern lay eggs, the eggs are either green or yellow. The biologists have observed over the years that 33% of the eggs are yellow, and the rest green. Next spring the lead scientist has permission to randomly select 69 of the dragon eggs to incubate. Consider all the possible samples of 69 dragon eggs.What is the usual number of yellow eggs in samples of 69 eggs? (Give answers as SENSIBLE whole numbers.)minimum usual number of yellow eggs = maximum usual number of yellow eggs =A sheriff wanted to see if there was a difference in the number of arrests in a certain city for four types of crimes. A random sample of 160 arrests showed a distribution of 38 arrests for larceny thefts, 50 for property crimes, 28 for drug use, and 44 for driving under the influence.. Is there enough evidence to reject the claim that the number of arrests for each category of crimes is the same? Use α = 0.05Imagine that you have arrived in Malate, Manila to conduct a case study onworking street children. A local social worker introduces you to two formerstreet working children and you leam that they still have lots of friends stillworking on the street. As a way to identify participants for your study, you askthe two former street working children if they can recommend and invite someof their friends on the street to participate in the study. You also ask them tospread word of the study in anticipation that their friends will also help you toidentify potential participants.How would you classify this kind of sampling? 1. Quota sampling? 2.Snowball sampling? 3. Random purposeful sampling? Explain your answer.