Question 8 Netflix Addiction. A research was conducted to assess the impact of Netflix on students' academic performance. A random sample of 400 students resulted in a sample mean of 10.7 hours (watched per week) with a standard deviation of 4.2 hours. Calculate a 99 % confidence interval for the data (round your answer to 2 decimal places). Show a complete solution and explain the meaning of the confidence interval.

Q: last birthday gift. The In à survey, 22 people were asked how much they spent on their chil results…

A: It is given that the sample mean and the sample standard deviation are 41 and 5 respectively. The…

Q: In a survey, 30 people were asked how much they spent on their child's last birthday gift. The…

A: Solution:

Q: Several years ago, 44% of parents who had children in grades K-12 were satisfied with the quality of…

A: The claim is that 44% of parents who had children in grades K-12 were satisfied with the quality of…

Q: y selected textbooks' weights, and find they have a mean weight of 78 ounces. Assume the population…

A: As the population standard deviation is known, we will use z distribution. The value of z at 95%…

Q: A random sample of 54 four-year-olds attending day care centers provided a yearly tuition average of…

A:

Q: In a survey, 10 people were asked how much they spent on their child's last birthday gift. The…

A: We have given that,  Sample mean (x̄) = 34, standard deviation (s)=6 and sample size (n) = 10 Then,…

Q: A local news outlet reported that 56% of 600 randomly sampled Kansas residents planned to set off…

A: We have given that,  Sample proportion (p̂) = 56% = 0.56 and sample size (n) = 600 Then,  We will…

Q: A random sample of 59 four-year-olds attending daycare centers provided a yearly tuition average of…

A:

Q: A car repair business randomly selects receipts for parts purchased on 16 different jobs. The mean…

A: given data, n=16x¯=31.32s=30.42CI=0.95α=1-0.95=0.05df=n-1=16-1=15we  have to construct the 95%…

Q: A random sample of 230 people living in Seattle found that 83 of them had a pet. A random sample of…

A: Solution: Given information: n1= 230 Sample size of people iving in Seattle n2= 172  Sample size of…

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: Dana is a math professor who usually teaches in-person but has recently started teaching online.…

A: Given that, mean , μ=76.5standard deviation,σ=19.1and sample mean(class-average),x =68.4 and sample…

Q: A sample of 47 Charleston County households have a mean income of $32,346 with a standard deviation…

A: The sample size is 47, sample mean is $32346, and sample standard deviation is $8571. The confidence…

Q: In a survey, 13 people were asked how much they spent on their child's last birthday gift. The…

A: We have to construct ci.

Q: If a school district takes a random sample of 75 Math SAT scores and finds that the average is 433,…

A:

Q: In a survey, 45 people were asked how much they spent on their last partners birthday gift. The…

A: Given information- Sample size, n = 45 Significance level, α = 0.10 Sample mean, x-bar = $90 Sample…

Q: In a study of 120 randomly selected families, 50 said they streamed their television content. Find…

A:

Q: You measure 43 randomly selected textbooks' weights, and find they have a mean weight of 33 ounces.…

A: We have to find 95% confidence interval for the true population mean textbook weight.

Q: A study investigated ways to prevent staph infections in surgery patients. The researchers examined…

A: From the provided information, Sample size (n) = 100 From which 88 patients tested positive for…

Q: "About 25 percent of college According to the website www.collegedrinkingprevention.gov, students…

A: sample size(n)=56Mean(x)=3.94standard deviation(s)=3.43confidence level=90%

Q: Based on a sample of repair records, an engineer calculates a 95% confidence interval for the mean…

A: From the given information 95% confidence interval is ($140,$160) Supervisor reports that “We are…

Q: A Harris Poll in 2003 asked a national sample of 2316 adults whether they favored or opposed…

A: The random variable opposing follows binomial distribution. The sample size is 2316. The value of…

Q: You measure 35 textbooks' weights, and find they have a mean weight of 36 ounces. Assume the…

A: Given information- Population standard deviation, σ = 9.3 ounces Sample size, n = 35 Sample mean,…

Q: one with a 95% confidence level and the other with a 99.7% confidence level. Which interval is…

A: Confidence interval is probability, which refers that population parameter will fall within set of…

Q: Construct a 99% confidence interval to assess whether this represents evidence that parents'…

A:

Q: How much more sensitive to contrast are athletes with eye grease than without eye grease? Give a 95%…

A:

Q: You measure 29 backpacks' weights, and find they have a mean weight of 46 ounces. Assume the…

A:

Q: You measure 20 dogs' weights, and find they have a mean weight of 44 ounces. Assume the population…

A: Since we know population standard deviation, use z-distribution to find z-critical value. Find…

Q: Construct a 95% confidence interval estimate. How does this change your answer to (b)?

A: (d)

Q: A poll asked for people's opinion on whether closing local newspapers would hurt civic life. 425 of…

A: We have given that, Favorable cases (X) = 425 and sample size (N) = 1002  Then,  We will fins the…

Q: A learn-to-type software program claims that it can improve your typing skills. To test the claim…

A: Before After 52 47 44 42 40 46 50 43 46 34 38 50

Q: Question Help magazine routinely checks the drive-through service times of fast-food restaurants. A…

A: Given dataConfidence interval = 95%n = 568lower bound = 162.2upper bound = 165.495% confidence…

Q: A study investigated ways to prevent staph infections in surgery patients. The researchers examined…

A: given data  n = 100 x = 86 80% ci for p.  p^ = xn = 86100 = 0.86

Q: A survey commissioned by the Southern Cross Healthcare Group reported that 16% of New Zealanders…

A: 1.Suppose p is the true population proportion of people, who consume five or more servings of drinks…

Q: A journal article reports that a random sample of 25 antivirus software packages was used as a basis…

A: given data  98% confidence interval for μ :  (206,293) margin of error (E) = ?

Q: A sociologist develops a test to measure attitudes towards public transportation, and 37 randomly…

A: given that,sample mean, x =58.5standard deviation, s =19.7sample size, n =37standard error = sd/…

Q: company manufactures a certain over-the-counter drug. The company samples 80 pills and finds that…

A: We have given that  Sample size n = 80 Sample mean = 325.5 Standard deviation s=10.3 90%confidence…

Q: Several years ago, 46% of parents who had children in grades K-12 were satisfied with the quality of…

A: Given  p=0.46, n=1055, X=488