
could you use R to solve it, please
could you use R to solve it, please 6. A city of 25,000 people wants to...
R=5
please use z table for distribution question
(a) A researcher plans to carry out a study to estimate the proportion of residents in a city who have travelled abroad last year. If he wants to be 95% confident that the estimate is accurate to within (2.73 + ) %, find the minimum sample size that is required. (3 marks) A researcher plans to carry out a study to estimate the mean age of teachers in a city. If he...
A government official is in charge of allocating social programs throughout the city of Vancouver. He will decide where these social outreach programs should be located based on the percentage of residents living below the poverty line in each region of the city. He takes a simple random sample of 128 people living in Gastown and finds that 20 have an annual income that is below the poverty line. Suppose that the government official wants to re-estimate the population proportion...
Solve 7,10,11,12 in business stat 2430
Name: The mayors office wants to know how people in the city feel about the condition of the city's roads. They place an announcement in the newspaper asking residents to email their opinions to the mayor's office. Five hundred people send e als and about 84% of the responses indicate displeasure with the condition of the city's roads A) This is a simple random sample. It gives very accurate results B) This is a...
5
and 6 please
The length of time it takes collese students to find a parking spot in the library parking lot follows a normal distribution with a mean of 3.0 minutes and a standard deviation of 1 minute. Find the probability that a randomly selected college student will find a parking spot in the library parking lot in less than 2.5 minutes. 6. About 74% of the residents in a town say that they are making an effort to...
Please provide excel Formulas. thank you
Scenario 2: A study is performed in a small southern town to determine whether the average weekly grocey bill for a four-person family is significantly less than national average of $185. A simple random sample of 19 weekly grocery bills for four-person families is selected from the town. The data is shown to the right. They suspect from the sample data that the small town's average grocery bill is less than the national average....
can you please answer 2a b c and d
2. Use the table below to calculate the answers to the questions that follow it. Be sure to write how you are calculating your answer. You must include the numbers from the table when showing your work. The following table shows a sample of CSI whether they signed up for the Winter session since attending CSI and whether they live in Staten Island. Results of a survey follow: Residence/Winter Staten Island:Staten...
***Please solve the problem below using R, and provide the R code you used in order to do so*** The mean undergraduate cost for tuition, fees, room, and board for four-year institutions was $26,489 for the 2004-2005 academic year. Suppose that the standard deviation of the distribution was $3204 and that 36 four-year institutions are randomly selected. Find the probability that the sample mean cost for these 36 schools is a. Less than $25,000 b. Greater than $26,000 c. Between...
1. A random sample of n measurements was selected from a population with standard deviation σ=13.6 and unknown mean μ. Calculate a 90 % confidence interval for μ for each of the following situations: (a) n=45, x¯¯¯=89.8 ≤μ≤ (b) n=70, x¯¯¯=89.8 ≤μ≤ (c) n=100, x¯¯¯=89.8 ≤μ≤ (d) In general, we can say that for the same confidence level, increasing the sample size the margin of error (width) of the confidence interval. (Enter: ''DECREASES'', ''DOES NOT CHANGE'' or ''INCREASES'', without the...
You are a psychologist who is taking some time away from the city for a while and write a textbook. To do so, you've moved to a very remote, rural area. It is so rural, in fact, that nobody in the entire town has indoor plumbing. As you start to unpack, you are overwhelmed by the stench from your outhouse, and it is such a horrible experience that you begin to rethink every decision you've ever made. Before moving again,...
please help
1.5.19 A study in Psychonomic Bulletin and Review presented evidence that people use facial prototypes when they encounter different names." Participants were given two faces and asked to identify which one was Tim and which one was Bob. The researchers wrote that their participants "overwhelmingly agreed on which face belonged to Tim and which face belonged to Bob but did not provide the exact results of their study. Here we explore if students will correctly assign the name...