In a sample of 300 days, St. Petersburg has 171 foggy days. In an independent sample of 200 days, Stockholm has 92 foggy days. Compute the 95% CI for the difference between the two population proportions of foggy days.

Q: A coffee owner wanted to determine how much caffeine was in each cup of coffee being served. A…

A: Note: Hi there! Thank you for posting the question. As your question has more than 3 parts, we have…

Q: Calculate the proportion of the 100 samples that had at least five people own a dog. Round your…

A: You can use normal approximation..

Q: A hydroponic grower was trialling two different greenhouse systems for growing tomatoes. To compare…

A: (c). Explain why one of the weights in green house A was identified as an outlier: The presence of…

Q: From the analysis of students’ marks, Mr Adam decided to do one-to-one consultation with his…

A: If we consider that the students should bring the marks above the median, they are only exempted…

Q: Whose paint has a greater ratio of red to yellow?

A: comparing ratios red to yellow

Q: A researcher reports an F-ratio with df=3,70df=3,70 for an independent-measures research study.…

A: Given: A researcher reports an F-ratio with df=3,70

Q: A random sample of 324 residents of a community revealed that 30% were very satisfied withthe…

A: Given that, Critical values: By using the standard normal table of Z, the critical value for two…

Q: What percentage of the variation in  can be explained by the corresponding variations in  and  taken…

A: X1 is the dependent variable  X2 and X3 are the independent variables.

Q: Given that Germany has a death rate of 11.6 per 1000 and a population of 80,722,792, about how many…

A: The Germany has a death rate of 11.6 per 1000. That is 11.6%, and a population of 80,722,792.

Q: In a village actually invaded by anthrax, 65% of the gouts were attacked and 90% have been…

A:

Q: If a coin is flipped 150 times and the number of Hs is 25. Compute the proportion of Hs. Round to…

A: We have given that,  Favorable cases (X) = 25 and sample size (n) = 150 Then,  We will find the…

Q: Use the figure to the right, which shows the percentages of adults from severa power plants in their…

A: Null hypothesis: H0: pl=p2 Alternative hypothesis: Ha: pl≠p2

Q: Say that there are five populations, and we need to test for difference of population means.  If we…

A: Say that there are five populations, and we need to test for difference of population means. We test…

Q: In a comparison taste test of two juice drink 780 people preferred Cranberry Blast.Only 220 people…

A: In a comparison taste test of two juice drink 780 people preferred Cranberry Blast.Only 220 people…

Q: A researcher reports an F-ratio with df=2,27 from an independent-measures research study. How many…

A: Given, A researcher reports an F-ratio with df=2,27 from an independent-measures research study. Let…

Q: A worker at a frozen yogurt store has 2 3/4 cups of frozen yogurt to give to customers as samples.…

A: We have to find no. Of samples , using all the frozen yogurt.

Q: Use the figure to the right, which shows the percentages of adults from several countries who favor…

A:

Q: Do teachers find their work rewarding and satisfying? An article reports the results of a survey of…

A: From the provided information,

Q: What percentage of Births occurred among women between the ages of 40 and 42?

A: From the given table we have Total number of births = sum of all observation…

Q: Two fuel additives are tested to determine their effect on miles per gallon for passenger cars. Test…

A: State the null and alternative hypothesis: The investigator is specially interested to test whether…

Q: A survey of 400 non-fatal accidents showed that 189 involved the use of a cell phone. Determine a…

A: Given that, In a survey of 400 non-fatal accidents showed that 189 involved the use of a cell phone.

Q: c)   If the scientists want to estimate the proportion of deer that carry Lyme disease ticks to…

A: We have given that,  Margin of error (E) = 0.02 and confidence level = 90% Then,  We will find the…

Q: 1. Dr. Edgar Anderson was a botanist who collected vast amounts of data for several species of wild…

A: 1) mean = 5.55 standard deviation = 0.57 n=50 c=0.85 zc = 1.44 E = 1.44*σn = 1.44*0.5750 = 0.11607…

Q: a. What percentage of adult men can fit through the door without bending?

A: Let , X be the height of men. Here , X→N(μ=67.1 , σ=3.6) Since , the door height is 56.2 in. Our aim…

Q: A November 2018 Gallup Poll of 1075 U.S. adults found that 627 are satisfied with the total cost…

A:

Q: Based on table 3, compute the column percentages.

A: The below table shows the numbers of students who passed or failed professors Roth and Ahmadi's…

Q: a sample of ore is found to be 0.0012% diamond and 0.033% copper. What is the percentage of matter…

A: Given:- A sample of ore is found to be 0.0012% diamond and 0.033% copper To find:- The percentage of…

Q: In a random survey of 1500 adults in California and 1000 adults in Oregon, you found that 228…

A: Given that

Q: If your study consists of four groups, each with 15 subjects, and SSpet = 42 and SSw = 35, what does…

A: Number of groups, k = 4 Number of observations, N = 60 SSbet = 42 and SSw = 35

Q: An educator desires to estimate, within 4%, the true percentage of high school students who study at…

A:

Q: In a survey of 3121 people, 412 are under-vaccinated. What is the proportion of under-vaccinated…

A: Given data, Total no of people n=3121 No of people under vaccinated is x=412 What is the proportion…

Q: 1. How many samples must be considered from a population of 28,000 students, if 5% margin of error…

A:

Q: In order to study the mean blood pressure of people in his town, Richard samples the population by…

A: We know that stratified sampling involves dividing the population into groups and randomly selecting…

Q: What is the percentage of households with an intensified waste management system (dark green)?

A: The objective is to find the percentage of households with an intensified waste management system…

Q: By how many times does the sample size have to be increased to decrease the margin of error by a…

A: Formula for margin of error is ME = Zα/2 * σ / √n where Zα/2 = critical value

Q: A coffee owner wanted to determine how much caffeine was in each cup of coffee being served. A…

A: Given information: The data represents the amount of caffeine present in each cup of coffee that is…

Q: s comprise 65% of trees in the first orchard and 45% of trees in ards combined. What percentage of…

A: Let the number of trees in the first orchard be x and the number of trees in the second orchard be…

Q: a) What proportion of the sampled wafers had (P 2 8)? b) What proportion of the sampled wafers had…

A: 5. a) The frequency is, Number of Particles Cumulative frequency Frequency Number of Particles…

Q: 2. On a placement examination, August scored lower than 1210 of 12,860 students who took the exam.…

A: Given information: On a placement examination, 12860 students appeared. Among these 12860 students,…

Q: 1. What percentage of scores fell within ±1 SD for ZADHD?

A: Introduction: The "ZADHD" values indicate the z-scores of ADHD.

Q: Assuming a group has one uniform rate, 40% of the group receives a 10% rate increase and 60% of the…

A: We will consider that the group has total 100 members and each member of the group has a uniform…

Q: With no preliminary estimate of the proportion known, how many young adults would you survey to…

A: It is given that margin of error (E) is 0.10 and the confidence level is 0.99.

Q: Use the figure to the right, which shows the percentages of adults from several countries who favor…

A:

Q: For a nuclear reduction plan, to compare the approval rate from people with college degrees and the…

A:

Q: If 7 prunes provide 10% of vitamin A needed daily, what percent of the daily percent of vitiman A is…

A: In mathematics, a percentage is a number or ratio expressed as a fraction of 100. It is often…

Q: How many blocks were used in this experiment?

A: Given that number of levels k = 5 We have to find number of blocks b

Q: A Scientist wished to compare effect of three botanical extracts as anti diabetes drug. He felt…

A: Q

Q: A recent survey found that in a particular city of all poor children born in 1980, 11,500 enrolled…

A: Scaling of data:The scaling of data, or in other words, normalization of data is a mathematical…

Q: Give two reasons why it would be necessary to examine a sample of the shirts produced rather than…

A: Give two reasons why it would be necessary to examine a sample of the shirts produced rather than…

Q: Of the 1,000 total calls, 51 did not result in a satisfactory outcome. Thus, the proportion of calls…

A: Of the 1000 calls 51 didn't result satisfactory outcome. Hence total number of unsatisfactory…