A survey found that in a sample of 100 families, 37 owned cats. A survey done 5 years ago found that in a sample of 80 families, 34 owned cats. At ? = 0.05 has the proportion of cat owners changed over the 5-year period?

Q: What proportion of students studied more than 4 hours?

A: Given that Total number of students = 240 Number of students who studied more than 4 hours = 50

Q: Kevin scored at the 70th percentile on a test given to 9920 students. How many students scored lower…

A:

Q: Using a random sample of 3800 TV households, a media research company found that 50.3% watched the…

A:

Q: In a large data set, the 49th percentile is 523 and the 71st percentile is 675.  About what…

A:

Q: The correlation between the depth (in feet) and length (in feet) for a sample of caves is found to…

A:

Q: Maya conducted an experiment that tests the hypothesis that "Studying hours have a positive effect…

A: Here given Maya conduct experiment tests the hypothesis

Q: Find the percentile, rounded to the nearest percent, for Shaylen's score.

A: Concept: Percentiles are statistical measures that define the percentage of data points lying…

Q: In a survey 500 adults were interviewed, 150 said they had early medical checkup. Find the 95% for…

A: Givensample size(n)=500No.of adults said they had early medical checkup(x)=150p^=xn=150500=0.30

Q: A researcher finds that the correlation between the personality traits"greed" and "superciliousness"…

A:

Q: researchers found that the correlation between the number of pages in novels and the number of hours…

A: In this context, it is given that Researchers found that the correlation between the number of pages…

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: If a person’s z score equals -2.02, what is their percentile?

A: Given problem Given that   Given Person's z score =  -2.02 Using the Standard Normal Table ( Z Table…

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: An instructor teaching an 8 am class randomly samples a group of students who regularly attend class…

A: Generally Coffee tends to reduce the amount of sleep a person gets. So, we expect that more the…

Q: After taking a series of 4 classroom examinations, John obtained a mean score of 82. How much score…

A: Mean is a part of measures of central tendency.

Q: A recent study of young executives showed that 30 percent run, 20 percent bike and 12 percent do…

A: Note: Hi there! Thank you for posting the questions. As there are several independent questions,…

Q: You survey 100 people and find that 75 of them would prefer to work at home to some extent. When…

A: Given: You survey 100 people and find that 75 of them would prefer to work at home to some extent.…

Q: In a survey of 1150 adult males, 805 said they use the Internet. In a survey of 1050 females, 746…

A: There are two dependent variables which are males and females. The independent variable is using of…

Q: The last student surveyed was active for 25 minutes. What percent of students were more active than…

A: It is given that Min = 4, Median = 25 and maximum = 86

Q: Kevin scored at the 60th percentile on a test given to 9780 students. How many students scored lower…

A: Given that the percentile of Kevin is 60.This means 60% of the students will have score lower than…

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 random sample of 302 Californians found that 129 support Measure A. Build a 88% Cl for the…

A: Given that  Random sample size (n) = 302 Supported measure A = 129   Sample proportion (p) =…

Q: Roy is 4 years old and in the 69th percentile for neight in his age group. Vhat does this mean? Roy…

A: The percentile is used to measure the location of a data set.

Q: A sample with a mean of  8 has ∑ x = 72. How many scores are in the sample?

A:

Q: An article in the Archives of Internal Medicine reported that in a sample of 224 men, 73 had…

A: Here 224 men and 232 women are selected randomly. 73 of the men had elevated cholesterol levels,…

Q: The workers at drug factory took a random sample of 800 drug tablets and found that 40 of them were…

A:

Q: On a reading test, Shaylen's score of 455 was higher than the scores of 4236 of the 7276 students…

A: The pth percentile of a set of observations is the value below which, p% or (p/100) proportion of…

Q: If a person’s z score equals 2.08, what is their percentile?

A: Given info: The person’s z score equals 2.08.

Q: A state legislator wishes to survey residents of her district to see what proportion of the…

A: Answer:-  Given, Margin of error=7%=0.07 Confidence level=0.90 Let P=0.5 ( as we don't have sample…

Q: A recent polls show that 61% of adult Americans are comfortable with the legalization of marijuana,…

A:

Q: On a placement examination, Rick scored lower than 1228 of the 12,730 students who took the exam.…

A:

Q: NCAE shows that the average score of the students is 80 and sd is 15. What is the percentile rank of…

A: Given :     Mean (μ)=80Standard deviation (σ) = 15x=84

Q: Con side that the ten Percent of indlividuals getting tested for the Virus, have the Virus. Now…

A: Let A be the event denoteds the person having virus and B be the event denote the event the person…

Q: What percentage of the widow Students are female

A:

Q: An entertainment company surveyed 360 elementary school children and found that 153 of them were…

A:

Q: In a sample of 169 students, 16 said they have donated blood. What percent of the students have…

A: Given that, In a sample of 169 students, 16 said they have donated blood.

Q: The American Heart Association is about to conduct an anti-smoking campaign and wants to know the…

A:

Q: A Pew poll taken in 2010 surveyed 830 people aged 18-29 and found that 166 of them had one or more…

A: State the hypotheses.

Q: The median age at first marriage of US Woman (26.1 years) is what percentage less than the median…

A: We have been given the median age of woman and men and we have to find median age of woman is what…

Q: It is bleieved that the percent of convicted felons who have a history of juvenile deliquency is…

A: Solution: State the hypotheses Null hypothesis: That is, the percent of convicted felons who have a…

Q: What percentage of the widow students are  female

A: Total widowed students=2+3=5Total female students who are widowed=3

Q: On a reading test, Shaylen's score of 455 was higher than the scores of 4252 of the 7274 students…

A: The percentile of score x is calculated by below formula percentile of score x =Number of data value…

Q: A study reported a correlation between height and weight r = .5, p < 0.05. What is the proportion of…

A: Here correlation between height and weight is r = 0.5 and p&lt;0.05

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

A: Decision rule using p-value :      1) Reject null hypothesis (H0) if p-value less than significance…

Q: In a survey of 1150 adult males, 805 said they use the Internet. In a survey of 1050females, 746…

A: From the provided information,

Q: Sean also took the SAT (μ=1010,σ=200) and had a z score of +0.25. What was his SAT raw score? What…

A: Given data, μ=1010 σ=200 z-score=0.25

Q: A student answered 78 out of 100 homework questions correctly on the first try. What percent of…

A: Solution-: A student answered 78 out of 100 homework questions correctly on the first try. What…

Q: What is the percentage of players whose age is less than 32?

A: here given  mean = 33 year  standard deviation  =  2 year x= retirement age

Q: What would be the correlation between the ages of husbands and wives if men always married woman who…

A: In all the cases the correlation will be 1 because we have a clear relation for the data set in each…

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.