A researcher wishes to estimate the proportion of all adults who own a cell phone. He takes a random sample of 2000 adults; 1650 of them own a cell phone. The population of interest to the researcher is

Q: Approximately 10% of students have a composite score below what level

A: If X is the composite score of the students, then we need to search for a x, such that P[X≤x]=0.1.

Q: If you want a poll to have a margin of error of 2.84%, how large will your sample have to be?

A:

Q: A population is normally distributed with µ = 86 and σ = 12. For this population, what is the 78th…

A: The population mean is 86 and population standard deviation is 12. The 78th percentile is, The…

Q: In most research, what does the p-value have to be for results to be considered statistically…

A: Here we want to know correct option.

Q: If the proportion of H’s is .45 out of 200 flips, what is the p-value?

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Q: A survey of 225 residents of a neighborhood indicates that 135 of them are in favor of having a…

A: Given, total residents = 225 135 are in favor of block party.

Q: The 70th percentile of the data presented in the table above is

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Q: A sample selected from a population gave a sample proportion equal to 0.60.

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Q: The province of Pangasinan has a population of 3,163,190. Calculate the sample size using Yamane's…

A:

Q: How large the sample size should be in order to be 98 percent confident, if the sample proportion is…

A: Given data, p=0.78 E=0.16 z-value at 98% confidence is Zc=2.326 n=?

Q: According to The Census Bureau, 60% of adults buy clothing online. a) How many adults did they…

A: Solution: a. From the given information, p=0.60 and E=0.03. The confidence level is 0.95.

Q: In a class of 95 students, the heights of two students were measured and found to be 165 cm. If this…

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Q: If the distribution is approximately mound-shaped, what is the proportion less than 80.12 ? 15

A: Find the value of z using mean and standard deviation.

Q: In a shipment of 500 light bulbs, 25 of them were broken. What percentage of the light bulbs were…

A: Given ,  In a shipment of 500 light bulbs , 25 of them were broken . We have to find the  percentage…

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

A: There are two independent samples which are Country B and Country C. We have to test whether the…

Q: What percentage of the sample were female drivers?

A: It is given that Total = 5+7+11+9 = 32 Number of females = 7+9 = 16

Q: A survey of 150 people revealed that 115 people like ketchup on their hot dogs, 85 people like…

A: Concept of General Addition Rule: For any two events A and B the General Addition Rule state that:

Q: What percentage of scores would be above 567?

A:

Q: d. The managers of a local luxury hotel would like to set the hotel's average daily rate at the 75th…

A: Let P75 denote the 75th percentile i.e below which 75% of hotels rate are set.

Q: Suppose that in a group of 800 women, the percentage who work is the same as in the sample here, how…

A: men women total work 15 23 80 not work 23 28 51 total 38 93 131

Q: A company took a survey about its new product. 7,200 people liked the new product and 800 people did…

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Q: A researcher wishes to estimate the proportion of corporate executives whose annual salary is over…

A:

Q: Consider a survey in which 1000 people are asked “How often do you go to the dentist?”  The variable…

A: Given: Number of people that have been involved in the study = 1000

Q: A researcher is running a study to determine the proportion of men that wear neckties to work. To…

A: Since, we answer only first three sub-parts of a question, we will answer the first three. Please re…

Q: A researcher is interested in maximum-security inmates. She groups inmates by the type of crime…

A: Here, the stratified random sampling method was used. Because the whole population was divided into…

Q: Find the probability of selecting either a non-smoker or a woman when you select a person at random…

A:

Q: A researcher wants to determine what proportion of all high school students plans to attend…

A: Obtain the critical value at 90% confidence level:It is given that the margin of error is 0.02. The…

Q: a nutritionist wishes to determine, within 3% the true proportion of adults who do not eat lunch. if…

A:

Q: A politician is Interested in the proportion of voters in his district that think he is doing a good…

A: Given dataA politician is intrested in the proportion of voters in his district thet thinkhe us…

Q: What percentage of people are men who like movies?

A:

Q: what percentage of the men worked?

A: men women total work 15 23 80 not work 23 28 51 total 38 93 131 what percentage of the…

Q: How many scores are in the population?

A: here given, SS = 328 variance = σ2 = 8

Q: The US population is 13% African American.  If you were to take a SRS of 500 Americans, above what…

A: Solution:From the given information, the proportion of African American is 0.13, random sample of…

Q: Raymond wants to estimate the percentage of parents that use cloth diapers. He asks a randomly…

A: According to the provided information, The data set will represent the collection of response…

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

A: We have to test the claim that "the proportion of adults in Country C who favor building new nuclear…

Q: The histogram shows the distribution of hurricanes that have hit a country from 1851 through 2015,…

A:

Q: Why must the sum of all fs in a sample equal N?

A: Every datum in a sample is assigned to a category/class depending on its value. For a given dataset,…

Q: A population with a mean of 8 has a sum of 40. How many scores are in the population?

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Q: Suppose X~N(19, 2.5).  Find the 50th percentile.

A: Introduction: The random variable X has a normal distribution, with parameters- mean, μ = 19, and…

Q: In a series of houses actually invaded by smallpox, 70% of the inhabitants are attacked and 85% have…

A: Suppose A & B be two events. Then we know, (A∪B)=(A)+(B)-(A∩B). Consider from the problem that,…

Q: what percentage of the women did not work?

A: men women total work 15 23 80 not work 23 28 51 total 38 93 131 percentage of the women…

Q: The US population is 13% African American.  If you were to take a SRS of 500 Americans, below what…

A: From the given data The US population is 13% African American

Q: many males are in the sample?

A: A survey of 500 people is shown in a tree diagram M-male F-female E-eat breakfast D-does do not eat…

Q: Suppose that the result of a public opinion poll shows that just 10% of people would be willing to…

A:

Q: class YES NO Undecided freshman 48 21 11 sophomore 34 52 What proportion of those surveyed were…

A:

Q: Find the probability of selecting either a non-smoker or a woman when you select a person at random…

A:

Q: A principal of a college wants to estimate the proportion of smokers among his students. What

A: Given : Margin of error, E = 10% = 0.10 Sample proportion = 0.30

Q: You would like to be 99.9 confident that your estimate is within 2% of the true population…

A:

Q: If the proportion of Hs is .25 out of 200 flips, what is the p-value? Round

A: Here proportion of head in fair coin should be 0.5 So take hypothesis with proportion p is 0.5 or…

Q: What percentage of people eat fruits and vegetables and abstain from smoking, but do not partake in…

A:

Equations and Inequations

Equations and inequalities describe the relationship between two mathematical expressions.

Linear Functions

A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.