omestic cats kill many more wild birds in the United States than scientists thought”, states a recent article. Researchers used a random sample of ? = 300 households in the US with cats to estimate that 25% of household cats in the US hunt outdoors Using the normal distribution to find a 90% confidence interval for the population proportion ?. (Take z* = 1.645) a. Can we assume that the sample size is large enough to use the standard normal distribution? Why or why not? b. What is the best point estimate for ??  c. What is the margin of error without using StatKey?  d. Find and interpret a 90% confidence interval for the proportion of household cats in the US that hunt outdoors.

Q: Suppose that shoe sizes of American women have a bell-shaped distribution with a mean of 8.47 and a…

A: Empirical rule: The probability that the observation under the normal curve lies within 1 standard…

Q: Is there any difference in the variability in golf scores for players on a women's professional golf…

A: Hello! As you have posted more than 3 sub parts, we are answering the first 3 sub-parts.  In case…

Q: For a 4-units class like Statistics, students should spend average of 12 hours per week studying for…

A: Population mean μ=15, standard deviations σ=2

Q: Suppose that grade point averages of undergraduate students at one university have a bell-shaped…

A: Given, grade point averages of undergraduate students at one university have a bell-shaped…

Q: Many doctors are concerned about changes in the skin thickness due to scar tissue build up. Suppose…

A: We have to test at  that whether there is any change in the mean skin thickness from the average…

Q: A pharmaceutical company produces pills of dose level of 40 mg. To maintain the quality control, the…

A: Given information Hypothesized mean µ = 40 mg Standard deviation σ = 0.4 mg Sample mean x-bar = 39.5…

Q: Some college graduates employed full-time work more than 40 hours per week, and some work fewer than…

A:

Q: need help with number 12

A: Provided information is, in recent poll it is observed that out of 775 adults 476 chose window seat…

Q: A college admissions officer for the school’s online undergraduate program wants to estimate the…

A: The objective of this question is to determine whether the true mean age of online undergraduate…

Q: An article in the San Jose Mercury News stated that students in the California state university…

A: Sample size (n)=43 Sample mean=5.1  Sample standard deviation (s)=1.2  Population Mean μ=4.5  We…

Q: Researchers from a certain country were interested in how characteristics of the spleen of residents…

A: Given that n1=93, x¯1=11.1, s1=0.9, n2=107, x¯2=9.9, s2=0.8, α=0.01.

Q: A simple random sample of 21 people with early-onset dementia have the mean age at diagnosis of 52.3…

A: The random variable age is normally distributed. We have to test whether the mean age at diagnosis…

Q: The local Health Department conducted a study in 2009 of 900 adults asking each adult the number of…

A: Given Information: Sample size (n) = 900 Sample mean (x¯) = 7.946 Standard deviation = 6.567…

Q: A parenting magazine reports that the average amount of wireless data used by teenagers each month…

A: State the null and alternative hypotheses for the test. Fill in the blank below. H0: μ=6:…

Q: A single sample test of means is conducted with 25 observations. The sample mean is found to be 33,…

A:

Q: years, on average, to finish their undergraduate degrees. Suppose you believe that the mean time is…

A: Given: Population mean, μ=4.5 Sample Mean, x=5.1 Sample standard deviation, s=1.2 Sample size, n =…

Q: A researcher is testing the effect preschool has on the development of children – are children who…

A: Null Hypothesis: A hypothesis which is tested for plausible rejection is called the Null Hypothesis…

Q: Some college graduates employed full-time work more than 40 hours per week, and some work fewer than…

A: The sampling errors arising while rejecting the null hypothesis (H0) when it is considered true or…

Q: An article in the San Jose Mercury News stated that students in the California state university…

A: For the given data Perform one sample t test

Q: A government agency provides the number of miles that residents of the 75 largest metropolitan areas…

A: (a)   Obtain the point estimate of the difference between the mean number of miles that City A…

Q: A pizza delivery chain advertises that it will deliver your pizza in 30 minutes from when the order…

A: The question is about hypothesis testingGiven :Population mean delivery time (  ) = 30…

Q: Americans eat about 1.85 billion pounds of potato chips, or about 6.6 pounds per person annually. A…

A: Here given: Sample size = n = 32 Sample Mean = x = 8.8 Sample Mean = s = 3.5 Population mean = μ0 =…

Q: The average American consumes 99 liters of alcohol per year. Does the average college student…

A: Note- Since you have posted a question with multiple sub-parts, we will solve the first three…

Q: Find a 95% confidence interval for the variance when a random sample of size 10 is taken from a…

A: From the given information, the sample size is 10 and the sample variance is 16.00. Given that the…

Q: Salaries of 32 college graduates who took a statistics course in college have a mean of $66,300.…

A:

Q: An article in the San Jose Mercury News stated that students in the California state university…

A: Hypothesized mean µ = 4.5 years Sample size (n) = 43 Mean x̅ = 5.1 years Standard deviation (s) =…

Q: Suppose that IQ scores have a bell shape distribution with a mean of 105 and a standard deviation at…

A: Solution: Let X represent the IQ scores of students.  The distribution of X is bell shape…

Q: You would like to estimate the variance of GPA’s at SDSU.  You randomly select 14 students and get a…

A: From the provided information, Sample size (n) = 14 Sample standard deviation (s) = 0.981 Confidence…

Q: An article in the San Jose Mercury News stated that students in the California state university…

A: We have given that  Sample size n = 42  Sample mean = 5.1 Sample standard deviation =1.2

Q: A study was done on body temperatures of men and women. The results are shown in the table. Assume…

A:

Q: Previous research has shown that the mean number of ballpoint pens Americans use per year is 4.3…

A: Given that  Sample size n =20 Population mean =4.3 Population standard deviation =1.17 Sample mean…

Q: The director of research and development is testing a new medicine. She wants to know if there is…

A: Claim: medicine relieves pain in less than  349 seconds.

Q: Some college graduates employed full-time work more than 40 hours per week, and some work fewer than…

A: Given Some college graduates employed work full-time are >40 hours  others fewer than 40 hours

Q: The gas mileage for a 2020 Toyota Prius hybrid vehicle is skewed to the left, with μ = 55 miles per…

A:

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.