Suppose you have a sample of 6 observations from a normal population. the sample variance is equal to 4. Find a 90% lower confidence interval for the variance of the population.
Suppose you've computed the following least-squares regression line, 8-5 0.25x Where: x = degrees in Fahrenheit y = number of miles of jogging in a day Interpret the regression coefficient of this line. The average miles of jogging on a 70 degree day is 8.5. For each increase of one.
Suppose you have the following null and alternative hypothesis:
Ho: it is snowing.
Ha: It is not snowing
(A) in the context of this problem, describe a Type-1 error
(B) Describe Type II error
(C)Describe.
Suppose you wanted to perform a hypothesis test for a single proportion at the italic alpha equal 0.03 level of significance. Which of the following values of Z would mark the boundaries of the rejection region for this test? Select all that apply!
-2.33
.
survey of 52 households
a. find the percentile rank of 2
b.if the sample accurately reflects the population, then what % of households have at most two vehicles
.
Suppose you wish to predict production yield y as a function of several independent predictor variables. Indicate whether each of the following independent variables is qualitative or quantitative. If qualitative, define the appropriate dummy variable(s).
(1) The prevailing interest rate in the area
A).
susan marciano invested part of her 21000 bonus in a fund that paid a 10% profit and invested the rest in stock that suffered a 4% loss. find the amount of each investment in her overall ne tprofit was $1960.
Suppose you wanted to conduct an experiment on whether a certain advertisement is effective in increasing sales. Select a specific product or service.
How would you precisely, validly, and/or reliably measure your dependent variable?
How would you obtain a sample?
How.
Suppose you sample one value from a uniform distribution with a=0 and b=20.
A. What is the probability that the value will be between 12 and 19?
B. What is the probability that the value will be between 3and 6?
C..
Survey
The coordinates (N,E) of point T1 are (2345.000m,1222.000m) For the calculation of the coordinates of point B the following measurements with orresponding standard errors are obtained:
1) Determine the coordinates of points B;
2) Determine the standard errors of the.
Suppose your roommate believes the mean amount it will cost to repair your dorm refrigerator is more than $50. To determine if she is correct, suppose you perform a hypothesis test with level of significance equal to 5%. For each choice below, determine if you made the correct decision or.
Suppose you wish to estimate a population mean correct to within 0.15 with a confidence level of .90. You do not know ², but you know that the observations will range in value between 37 and 45. Complete parts a and b.
a. Find the approximate sample.
Susan suspected that her pet hamster was chubbier than her roommate's hamster. She weighed both critters and found out that her hamster weighed 250 g. whereas her roommate's hamster weighed 160 g. Can she conclude dial her hamster is heavier than her roommate's hamster? Why? George suspected that cats in.
Suppose you have run a 2_III^5-2 factorial and one of the main effects is confounded, so you wish to find out what is the cause behind the effect you detected. You talk with your boss about this, and he suggests to run a replicate where you should run all 8.
Suppose you want to collect a set of 5 (distinct) baseball cards. Assume that you buy one card at a time, and each time you get a randomly chosen card (from the 5 different cards available). Let X be the number of cards you have to buy before you collect.
Suppose you want to improve the quality of service for customers. After application of new
way of service, you send questionnaires to customers. It’s a five-point scale. -2 means customersfeel very unsatisfied with the new way. -1 means customers feel little unsatisfied. 0 means nodifference. +1 means.
Suppose you want to find out the grade you need to be in the top 18% of your class on an exam. From past experience your teacher estimates the mean will be 75 and the standard deviation will 10. What will be the minimum score needed to be in the.
Suppose you start at the origin and move along the x-axis 7 units in the positive direction, and then move downward a distance of 7 units. What are the coordinates of your location? x-coordinate y-coordinate = z-coordinate =.
Suppose your wait time for a shuttle bus in the morning is normally distributed with mu=8 minutes and sigma=5 minutes. Due to increased congestion in the afternoon, your wait time for a shuttle bus in the afternoon is normally distributed with mu=10 minutes and sigma=8 minutes. If you take the.
Sweaters are made in a design with three bands of colors: a top color, a middle color, and a bottom color. Eight colors are available and a color can appear in only one level. How many subsets of 12 different sweaters are there?.
suppose you want to select 45 residents to represent your community for an upcoming interview with the local paper about their feelings about the changes to services affecting the wel-being of the community. Which of the following is the best sampling method in order for the views to be representative.
Suzan sees a bag of marbles, she grabs a handful at random. She has seen a bag containing two red marbles, three green ones, four white ones, and two purple ones. She grabs eight of them. Find the probability of the following event, expressing it as a fraction in lowest.
Suppose you wanted to compare students in two different classes, assessing whether research methods or social psychology leads to more favorable ratings of how interesting psychology is.
Why would it be important to consider selection, attrition, and history?.
Suppose you have a parabola with the directory x y = mx + b and the focus (p, q). Then the equation of that parabola can be written as x2 + Bxy + Cy2' + Dx + Ey + F = 0 where B= C= D = ,and E =.
suppose you want to estimate the mean age at which US drivers get their driver's licences. Besed on a sample you obtain a point estimate of 17.5 years and a 90% confidence interval of 16.0<19.0.<="" p="" style="box-sizing: border-box;">
A. which methode of estimating the mean is perferable.
Suppose you have N points scattered on the x-y plane: (x_1, y_1), ..., (x_N, y_N). You would to fit a line through these points What is this process called? Regression Central limit theorem Law of largo numbers Hypothesis testing.
Suppose you want to estimate the population proportion of statistics nerds at college. To do so, you take a sample of 100 students and find that 20 of those students were bona-fide, genuine statistics nerds. What is the lower limit of the 90% confidence interval around your sample proportion?.
Surface water treatment rule (SWTR) regulation is an important part of the safe drinking water act of 1974 that ensures the treated drinking water quality. Explain SWTR regulation on; it addresses which particular water quality caused by what.
Suppose you have a sample of six spacer collars, whose thicknesses (in mm) are 39.015, 38.995,39.012, 39.007, 39.014, and 39.005. We denoted the population mean thickness by p and tested the hypotheses H_0: mu = 39.00 versus H_1 mu notequalto 39.00 Now assume that these six spacer collars were manufactured.
Suppose you want to construct a 90% confidence interval for the average speed that cars travel on the highway. You want a margin of error of no more than plus or minus 0.5 mph and know that the standard deviation is 7 mph. At least how many cars must you.
Suppose you have a normal distribution with known mu = 4 and sigma = 1. N(4, 1). Use Z=scores to compute the probability that a value drawn from this distribution will be: Greater than 2 Greater than 3 Less than 2.5 Between 3 and 5 Greater than 6 or less.
Suppose youre given an unbalanced coin and told that the probability p of flipping heads is either 1 or 3. You flip the coin twice and let 44 Y be the number of heads in two flips. For each possible value of Y , which of the two options for.
Suppose you were offered a ride in a new spaceship that is capable of accelerating at a value of 1 g (9.8 m/sec^2). Using the standard formula for V=a*t, compute how long it would take for you (with a=g) to reach 50% the speed of light (c = 3 x.
Suppose you want to determine the average height of basketball players in the NCAA Division I. In a random sample of 27 players, the sample average is 72.01 inches with a standard deviation of 5.003 inches. A 90% confidence interval for the average height is (70.368, 73.652). Which of the.
Surf Fast, an Internet service provider, is considering to offer a service in Cobb County, GA. They plan to charge $26 per customer for the service per month. About 20,000 customers in the county are expected to subscribe the service at that price. Note that the price per customer will.
Suppose you run a test of correlation at a significance level of 0.05, sample size 15, and you get the y= 9.53 + 0.231x and r=0.698. The mean for x is 2.45 and the mean for y is 9.81. What is the best predicted value for x=1.5?
.
Suppose you have just noticed using a PERT technique that the project will exceed the time allotted for the contract and that you may suffer contractual penalities as a result. How would you approach crashing activities in the project to get the project back on schedule?.
Suppose you have the following null and alternative hypotheses: H0: = 190 and H1: 190. You calculate a p-value of 0.067. At a level of significance of 0.05, what is your conclusion?
A: Reject the null hypothesis since the p-value < 0.05
B: Do.
Suppose you have the following null and alternative hypotheses: H0: = 200 and H1: 200. You collect a sample of data from a population that is normally distributed and the population standard deviation is unknown. The sample size is 25, the sample mean is 190, and the sample standard deviation.
Suppose you wish to compare the means of six populations based on independent random samples, each of which contains 10 observations. The values of Total SS and SSE for the experiment are Total SS 21.1 and SSE 16.9. The sample means corresponding to populations 1 and 2 are x1 S.
Suppose you wish to compare the mean years of education of faculty at USF to the mean years of education of faculty at the University of Tampa. Due to time and financial constraints you are informed that you cannot collect information from every faculty member in the population of interest..
susan marciano invested part of her $34,000 bonus in a fund that paid a 12% profit and invested the rest in a stock that suffered a 3% loss. find the amound of each investmen if her overall net profit was $480.
amount invested at 12%?
.
Suppose you own shares of a company's stock, the price of which has risen so that, over the past ten trading days, its mean selling price is $14.89. Over the years, the mean price of the stock has been $10.43 (X = $5.60.) You wonder if the mean selling price.
Suppose you have three bags of marbles: Bag 1 has 50 red, 25 blue, and 25 green marbles, Bag 2 has 30 red, 50 blue, and 20 green marbles, and Bag 3 has 20 red, 35 blue, and 45 green marbles. Past experience indicates that Bag 1 is chosen twice.
Suppse that the number of justices appointed in a year is a random variable with mean mu=0.5223 and variance sigma^2=0.5556.
A. Let the random variable X be the number of justices appointed in a year. Suppose that X has a binomial distribution with n=4. Find p (probability).
