# Statistics & Probability Questions and Answers

Recent questions in Statistics and Probability
emancipezN 2020-10-21

### Identify which assumption is needed to use the linear regression model to make inferences about the relationship. Identify which assumption is the least critical.

nitraiddQ 2020-10-21

### Explain which measure of spread would best describe the payroll:the range,the IQR, or the standard deviation.

mattgondek4 2020-10-21

### After hearing of the national result that 44% of students engage in binge drinking (5 dri a sitting for men, 4 for women), a professor surveyed a random sample of 244 students at his college and found that 96 of them admitted to binge drinking in the past week. Should he be surprised at this result? Explain.

mattgondek4 2020-10-21

### An issue of BARRON’S presented information on top wealth managers in the United States, based on individual clients with accounts of \$1 million or more. Data were given for various variables, two of which were number of private client managers and private client assets. a) Obtain a scatterplot for the data. b) Decide whether finding a regression line for the data is reasonable. If so, then also do parts (c)–(f). c) Determine and interpret the regression equation for the data. d) Identify potential outliers and influential observations. e) In case a potential outlier is present, remove it and discuss the effect. f) In case a potential influential observation is present, remove it and discuss the effect.

Tabansi 2020-10-21

### What does the variance of a random variable measure? What is the standard deviation of a continuous random variable X?

Rivka Thorpe 2020-10-21

### Understanding the Concepts and Skills Give correct answer for in using F-procedures to make inferences for two population standard deviations, why should the distributions (one for each population) of the variable under consideration be normally distributed or nearly so?

boitshupoO 2020-10-21

### An in-ground pond has the shape of a rectangular prism. The pond has a depth of 24 inches and a volume of 72,000 cubic inches. The length of the pond is two times its width. Find the length and width of the pond.

Khaleesi Herbert 2020-10-20

### Do the following summarize a categorical variable or a numerical variable? Explain. (1) For a football player, the average number of yards per carry in one game(2) For a basketball player, the shooting percentage during one game (3) For a baseball player, his batting average during the playoffs (4) For a hockey player, the time on ice per game

opatovaL 2020-10-20

### Check whether the standard error of the sampling distributions of bar p obtained in part(a) and part(b) are different.

Carol Gates 2020-10-20

### A January 2007 Gallup Poll question asked, "In general, do you think things have gotten better or gotten worse in this country in the last five years?" Possible answers were “Better”, "Worse”, "No Change", “Don't Know”, and “No Response". What kind of variable is the response?

UkusakazaL 2020-10-20

Line 2020-10-20

### Suppose you are testing whether the lifetime of 4 different types of lightbulbs. You run 5 experiments each. You get a mean square error of $M{S}_{E}=1.75$ and you reject the null hypothesis. The sample means you obtain for each lightbulb are below: Type 1: 20 Type 2: 30 Type 3: 28 Type 4: 22 Which pairs are significantly different at the $5\mathrm{%}$ significance level? Select all that apply.

waigaK 2020-10-20

### A population of values has a normal distribution with $\mu =26.8$ and $\sigma =33.8$. You intend to draw a random sample of size $n=89$. Find the probability that a single randomly selected value is between 17.1 and 25. $P\left(17.1? Write your answers as numbers accurate to 4 decimal places.

slaggingV 2020-10-20

### A) Explain why the chi-square goodness-of-fit test is not an appropriate way to find out. B) What might you do instead of weighing the nuts in order to use a x2 test? Nuts A company says its premium mixture of nuts con- tains 10% Brazil nuts, 20% cashews, 20% almonds, and 10% hazelnuts, and the rest are peanuts. You buy a large can and separate the various kinds of nuts. Upon weigh- ing them, you find there are 112 grams of Brazil nuts, 183 grams of cashews, 207 grams of almonds, 71 grams of hazelnuts, and 446 grams of peanuts. You wonder whether your mix is significantly different from what the company advertises.

permaneceerc 2020-10-20

### When drawing conclusions about the variance of a single population, what probability distribution is used?When comparing the variance of two populations, The assumption of is known to affect the F test's sensitivity when comparing two population variances. ?

Suman Cole 2020-10-20

### Explain whether there are any outliers in these data or not. The 5-number summary for the run times in minutes of the 150 highest grossing movies of 2010 is provided.

Tammy Todd 2020-10-19