In a survey of 70 business firms, it was found that 45 were planning to expand their capacities next year. Does this sample information contradict the hypothesis that 70% of the firms in general are planning to expand next year?
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A: We have given that, Sample size (n) = 10904 and favorable cases (X) = 2486 Then,
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A: H0 : p = 0.071 H1 : p > 0.071 Observed value of low birth = 28 Observed value of not low birth…
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A: Given Data; p^=147350=0.42 p=0.5 n=350
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A: From the provided information, Sample size (n) = 270 From which 195 say they're interest in their…
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Q: Sleep apnea is a condition in which the sufferers stop breathing momentarily while they are asleep.…
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Q: Among college students, the proportion p who say they're interested in their congressional…
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A: A)Verifying the conditions:It is given that, the proportion of the American population who use only…
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A: Solution:Part(D):Finding the test statistic value for the hypothesis test for…
Q: According to a census company, 7.1% of all babies born are of low birth weight. An obstetrician…
A: Here we conduct Z test for proprtion.
Q: Thirty-three percent of all Americans drink bottled water more than once a week (Natural resources…
A: Note: Hi there! Thank you for posting the question. Unfortunately in the sub-part(b), some required…
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A: Since, we answer only first three sub-parts of a question, we will answer the first three. Please re…
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A: Answer The sample size [n] =635The favorable cases [x] = 513The population proportion [p] = 0.80
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A: it is follow A,P with first term a = 2250, d = 2250 , n = 20
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Q: Step 2 of 3 : Compute the value of the test statistic. Round your
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A: Margin of error=E=5%=0.05 , Confidence level=C.I=94%=0.94
Q: Assume that a recent survey suggests that about 88% of computers use a new operating system.
A: The proportion is about 88% of computers use a new operating system.
Q: 3. A light bulb manufacturer finds that 4% of the bulbs it makes are defective. The quality control…
A: We will calculate percentage of 700 out of 15500 if it becomes 4% then we can agree.
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Q: Alcohol abuse has been described by college presidents as the number one problem on campus, and it…
A: Given that Sample size n =10904 Favorable cases x =2486
Q: Suppose an internet marketing company wants to determine the current percentage of customers who…
A: The objective of this question is to determine the sample size needed for a survey to estimate a…
Q: Among college students, the proportion p who say they're interested in their congressional…
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Q: According to the Pew Research Center, the proportion of the American population who use only a…
A: Given that n = 30 x = 16 α=0.10Given claim : proportion greater than 0.37The claim is either the…
Q: Alcohol abuse has been described by college presidents as the number one problem on campus, and it…
A:
Q: Suppose that in a survey of 1,000 U.S. residents, 721 residents believed that the amount of violent…
A: From the provided information, Number of residents = 1000 721 residents believed that the amount of…
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A: Introduction: It is required to identify the observational units and the population being studied.
Q: he North American Free Trade Agreement (NAFTA) enacted in 1994 is a trilateral trade agreement…
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Q: If 44.87% of people on earth have a smartphone, 25.41% have a tablet, and 9% own both a smartphone…
A: Solution-:Given: Percentage of people on earth have a smartphone =44.87%=0.44.87Percentage of people…
Q: question in a poll taken in 2007 asked, "Do you think the penalties for underage drinking should be…
A: Given data, n=500 p=61% =0.61 Construct a 95% confidence interval?
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- A friend of yours tells you that they heard that 65% of all college athletes end up losing a finger or toe in their college athletic career. You're highly skeptical of this, but your not sure if that percentage is an over exageration or an under exageration. You survey 101 former student-athletes and find that 60 of them lost a digit during their college athletic career. Is this enough evidence to conclude that the true percentage of student-athletes that lose a digit during their collegiate career is really different from 65%?A poll in June 2020 found that 83% of American parents believe that virtual learning instead of in- person learning widens the equity gap for students. A later poll in October 2020 asked 1025 American parents if they believe virtual learning instead of in- person learning widens the equity gap for students, and found that 820 believe that yes, virtual learning instead of in-person learning widens the equity gap for students. Does this mean that the proportion of American parents, who believe that virtual learning instead of in-person learning widens the equity gap for students, has decreased? Test at the 10% significance level. State the hypotheses. Но: р (? На: р (? Calculate the sample proportion. Round to four decimal places. Calculate the test statistic. Round to two decimal places. Z = Find the p-value. Give to four decimal places. p-value = State your decision. Since the p-value is less than 0.1, fail to reject Ho. Since the p-value is less than 0.1, reject Ho. | Since the…Thirty-five percent of all Americans drink bottled water more than once a week (Natural resources Defense Council, December 4, 2015). Suppose you have been hired by the Natural Resources Defence Council to investigate bottled water consumption in St. Paul. You plan to select a sample of St. Paulites to estimate the proportion who drink bottled water more than once a week. Assume the popluation proportion of St. Paulites who drink bottled water more than once a week is 0.35 , the same as the overall proportion of Americans who drink bottled water more than once a week. Suppose you select a sample of 540 St. Paulites. Show the sampling distribution of “p with a line over it” (to 4 decimals). E(p with a line over it) = 0` p with a line over it = Based upon a sample of 540 St. Paulites, what is the probability that the sample proportion will be within 0.08 of the population proportion (to 4 decimals). Probability = Suppose you select a sample of 190 St. Paulites. Show the sampling…
- Among college students, the proportion p who say they’re interested in their congressional district’s election results has traditionally been 75% . After a series of debates on campuses, a political scientist claims that the proportion of college students who say they’re interested in their district’s election results is more than 75% . A poll is commissioned, and 207 out of a random sample of 275 college students say they’re interested in their district’s election results. Is there enough evidence to support the political scientist's claim at the 0.01 level of significance? Perform a one-tailed test. Then complete the parts below. Carry your intermediate computations to three or more decimal places. (If necessary, consult a list of formulas.) (a) State the null hypothesis H0 and the alternative hypothesis H1 . H0: H1: (b) Determine the type of test statistic to use. ▼(Choose one) (c) Find the value of the test statistic. (Round…Sleep apnea is a condition in which the sufferers stop breathing momentarily while they are asleep. This condition results in lack of sleep and extreme fatigue during waking hours. A current estimate is that 11.911.9 million out of the 312.7312.7 million Americans suffer from sleep apnea, or approximately 3.8%3.8%. A safety commission is concerned about the percentage of commercial truck drivers who suffer from sleep apnea. They do not have any reason to believe that it would be higher or lower than the population’s percentage. To test the claim that the percentage of commercial truck drivers who suffer from sleep apnea is not 3.8%3.8%, a simple random sample of 347347 commercial truck drivers is examined by a medical expert, who concludes that 66 suffer from sleep apnea. Does this evidence support the claim that the percentage of commercial truck drivers who suffer from sleep apnea is not 3.8%3.8%? Use a 0.020.02 level of significance. Step 3 of 4 : Find the p-value. Round…A tv report conducted a survey of 681 people in Washington state and found that 26% of the population believe that Mt Saint Helen's will have a repeat eruption this year. In the accompanying dialogue, the reporter states, we are 91% confident that the true proportion of people in Washington state who believe that Mt saint Helen's wil have a repeat eruption this year lies between 20% and 32%. What does 91% represent in the report?
- According to the National Center for Education Statistics, 43% of the college students work full time. A survey of 900 randomly selected college students is to be conducted. For such groups of 900, would it be unusual to get 735 college students who work fulltime?In a 2018 Poll 447 out of 486 supported universal background checks for all gun sales in the U.S. In a similar poll from 2015, 276 of 321 interviewed supported universal background checks. Is this significant evidence that the percent of the population that supports universal background checks in the U.S. has decreased during this time?18. The governor of New York has banned selling or purchasing "large" soft drinks, where a "large" is defined as being more than 16 oz. Sonic, famous for its Route 44 drinks is interested in estimating the proportion of New Yorkers that favor this ban. From a random survey of 800 New Yorkers, 375 answered no to the question, “Do you favor the governor's ban on 'large' soft drinks?" a. Find a 97.5% confidence interval for the proportion of New Yorkers who favor the ban on "large" soft drinks. b. Interpret the confidence interval. c. Can you conclude with 97.5% confidence that a majority of New Yorkers favor the ban on "large" soft drinks? Why or why not. d. Without doing any other calculations, can you be 99% confident that a majority of New Yorkers favor the ban on “large" soft drinks?
- Based on market sales figures, approximately 7.9% of car owners in California own an electric or plug-in hybrid vehicle (EV). A marketing director at a local car dealership would like to know if their sales of EV's is any greater than what the state's sales proportions are. To examine this, they look over the last 500 sales (which they consider to be a representative sample of all car sales) and determine that 10.4% of those were EV sales. Is this statistically significant evidence that the dealership sells a higher proportion of EV's than the overall state's proportion? Which of the following are the correct null and alternative hypotheses for the hypothesis test used to determine significance? Ho:p = 0.079 Haip > 0.079 %3D O Ho:p = 0.079 Hai p > 0.104 O Ho:p 0.079 O Ho:p 0.104Suppose an internet marketing company wants to determine the current percentage of customers who click on ads on their smartphones. How many customers should the company survey in order to be 90% confident that the estimated proportion is within 2 percentage points of the true population proportion of customers who click on ads on their smartphones?