Among 1815 randomly selected high school students surveyed by the Centers for Diseases Control, 300 said they were current smokers. d. Interpret the 95% confidence interval in this context.

Q: The results of a study of 268 students who paid a private tutor to help them improve their scores on…

A:

Q: A poll reported that 67.7% of adults in a certain country believe that organic produce is better for…

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Q: Use the given data to construct a 98%confidence interval for the population proportion p x = 52 , n…

A: We have given that,  Favorable cases (X) = 52 and sample size (n) = 69 Then,  We will find the 98%…

Q: The correct value of Z to use for an 80% confidence interval for is: O A. 1.96 О В. 1.28 O C. 2.33 O…

A:

Q: Construct a 95% confidence interval for the proportion of people who performed any volunteer work…

A: It is given as Favourable cases, x = 517Sample size,, x = 517Confidence level = 95%

Q: A random survey of 495 adults found that 59 had diabetes. Which of the following is a 98% confidence…

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Q: Table 2.1. Cross Classification of Belief in Afterlife by Gender Belief in Afterlife Gender Yes…

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Q: What z-value is associated with a 99% confidence interval? O a. -1.645 O b. 1.645 O C. 1.96 O d.…

A: We have given that Confidence level (c) = 99% = 0.99Significance level (α) = 1- 0.99 = 0.01

Q: In a survey conducted by the Gallup Organization, 1100 adult Americans were asked how many hours…

A: Confidence interval give a range of values for the unknown parameter of the population. The width of…

Q: An article in an educational journal discussing a non-conventional high school reading program…

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Q: Construct the confidence interval for the population mean y. C=0.95, x= 16.7, o= 4.0, and n= 75. A…

A: Here, C=0.95, x=16.7, σ=4.0, and n=75.

Q: Researchers randomly selected 50 males between the ages of 25 and 44 years to participate in a…

A: The given 95% confidence interval for the proportion of all males between 25 and 44 years old with…

Q: In a sample of 100,40 said they preferred Pepsi to Coke. A 95% confidence interval for the…

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Q: Students at Green River plans a study to stats Test scores. Previous research has shown the…

A: We have given that  Margin of error =E =0.5 Population Standard deviation = 1 99%confidence…

Q: In a random sample of 850​ Americans, 385 reported that they work two jobs. Which of the following…

A: The known values are, The sample proportion is,

Q: In terms of z scores, a 95% confidence interval consists of which of the following ranges? 1. ±1 z

A: Given, Z=x-μσ where, x= observed value μ=mean of the sample σ=standard deviation

Q: If n=12, =49, and s=8, construct a confidence interval at a 80% confidence level. Assume the data…

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Q: In a sample of 100, 40 said they preferred Pepsi to coke. A 95% confidence interval for the…

A:

Q: A history teacher records the SAT scores of all 87 of her students. The data is used to construct a…

A: For calculating the confidence interval, we need to satisfy the following conditions: Independence…

Q: If n=18, ¯x=x¯=34, and ss=15, construct a confidence interval at a 98% confidence level. Assume the…

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Q: Construct the confidence interval for the population mean y. C= 0.90, x=16.6, o= 10.0, and n= 80

A: Here, C=0.90, x=16.6, σ=10.0, and n=80.

Q: A 95% confidence interval for the population proportion of professional tennis players who earn more…

A: 95% confidence interval for p : (0.82,0.88)Sample size used(n) = ? Margin of error : E = sample…

Q: sample of 16 students was taken from university. These students spent an average of $170 on books…

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Q: Find the following. z a/2 at the 86% confidence interval

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Q: This was a question on my homework and I would like to know if I answered it correctly. Thank you…

A: Odds (O):The “odds” of the occurrence of an event is the ratio of the number of occurrences of the…

Q: Find ??/2 for the 93% confidence interval. Select one: A. 1.83 B. 1.81 C. 1.80 D. 1.82

A: Solution: Given information: Confidence level = 93% = 0.93 α=1-confidence level α=1-0.93= 0.07…

Q: A​ 95% confidence interval for the proportion of U.S. adults who subscribe to some sort of streaming…

A: In the above question, we are given,  a confidence interval is

Q: A recent survey of 54,000 randomly selected adults studied the religious affiliations of Americans.…

A: From the provided information, Sample size (n) = 645 From which 116 said they claimed no religious…

Q: A poll conducted randomly in 2014 found that 52% of U.S. adult Twitter users get at least some news…

A: Proportion is 0.52. The standard error 0.024 The absolute value of Zα/2 is 2.5758 using the Excel…

Q: A survey was conducted that asked 1007 people how many books they had read in the past year. Results…

A: given that,sample mean, x =12.2standard deviation, s =16.6sample size, n =1007standard error = sd/…

Q: If α = 0.05, then what is the confidence level?

A: Given: α = 0.05   we know that, Confidence level+ α = 1

Q: In a Harvard School of Public Health survey, 2105 of 10,904 randomly selected U.S. college students…

A: Given data is appropriate for testing of hypothesis. Because it is a large sample test for single…

Q: A random sample of high school students is used to estimate the mean time all high school students…

A: Solution: From the given information, a 99% confidence interval is 1.7 hours to 3.1 hours.

Q: o test the effect of a physical fitness course on one's physical ability, the number of sit-ups that…

A: Solution:  Let x = Sit ups before  and y = Sit ups after  x y d=y-x (d-d) (d-d)2 34 49 15 7.1…

Q: A newspaper reported that 90​% of people say that some coffee shops are overpriced. The source of…

A:

Q: Latasha is a waitress at Seventh Heaven Hamburgers. She wants to estimate the average amount each…

A:

Q: The tobacco industry closely monitors all surveys that involve smoking. One survey showed that among…

A: Confidence interval : Confidence interval is a range of values and it contains the true population…

Q: Free of CVD       Prevalent CVD    Total Men          1548                 244                 1792…

A: Given The tota number of men with CVD =244The tota number of women with CVD =135The tota number of…

Q: A manufacturer must test that his bolts are 4.00⁢cm long when they come off the assembly line. He…

A: From the provided information,Population standard deviation (σ) = 0.45Sample mean (x̄) = 4.07Sample…

Q: To test the effect of a physical fitness course on one's physical ability, the number of sit-ups…

A:

Q: Construct the confidence interval for the population mean u.  c​= 0.95, x= 15.7, o= 7.0, and

A: c​= 0.95, x= 15.7, o= 7.0, and n= 90

Q: If the alpha level is .05, then the confidence level is ?

A: Given: alpha = 0.05 confidence level / significant level = 1 - alpha

Q: Construct a 99% confidence interval to estimate the population mean using the data below. x=37 o=11…

A:

Q: In a survey of 1002 people, 70% said that they voted in a recent presidential election. In…

A: n=1002

Q: Suppose that a random sample of 128 graduate-admissions personnel was asked what role scores on…

A: From the provided information, Sample size (n) = 128 From which 70 answered "very important". Sample…

Q: A sofa manufacturer is interested in the sales their chain of stores. They draw a random sample of…

A:

Q: A trade magazine routinely checks the drive-through service times of fast-fod restaurants. A 95%…

A: Given : confidence level =95%Lower limit =163.3Upper limit =167.1

Types of Bias

Statistics is the study of data collection, organization, analysis, interpretation, and presentation. Statistical bias is a characteristic of a statistical technique or its findings in which the expected value deviates from the actual root quantitative parameter being estimated. According to the actual definition of bias, it refers to the tendency of a statistic to overestimate or underestimate a parameter.