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Recent questions in High school statistics

Minerva Kline 2021-11-30

The table shows data for bus arrivals at one stop. By how much time can you expect a bus to be late?
$\begin{array}{ccc} Minutes Late & 0 & 1 & 2 & 3 & 4 & 5 \\ Number of Days & 8 & 7 & 3 & 4 & 2 & 1 \end{array}$
$t i m e = ? min$

pamangking8 2021-11-30

An engineering company has four openings and the applicant pool consists of 6 database administrators and eight network engineers. All are equally qualified so the hiring will be done randomply. The hiring committee consists of 4 women and 4 men.
a. If one person on the hiring committee is chosen at random to draw the names is a woman
b. How many ways can the group who are to be hired be formed if there are no restrictions on composition?
c. How many ways can 3 database administrators be chosen?

deliredejoker7m 2021-11-30

The amount of time each household in a sample watches television each week is calculated. The mean of the data is 31 hours and the median is 27.2hours. Twenty-four of the families in the sample turned on the television for 16 hours or less for the week. The 8th percentile of the data is 16 hours.
Based on the given information, determine if the following statement is true or false.
The first quartile is less than 16 hours.

Nefissi8u 2021-11-30

The following table gives the total caseload (in millions) in a states

Grady Turner 2021-11-30

The recommended daily dietary allowance for zinc among males older than age 50 years is 15mg/day. An article reports the following summary data on intake for a sample of males age 65-74 years: $n = 117, \overset{―}{x} = 12.1, and s = 6.98$ . Does this data indicate that average daily zinc intake in the population of all males age 65-74 falls below the recommended allowance? (Use $α = 0.05$ .)
State the appropriate null and alternative hypotheses.
1) $H_{0} : μ = 15$
$H_{a} : μ > 15$
2) $H_{0} : μ = 15$
$H_{a} : μ \leq 15$
3) $H_{0} : μ = 15$
$H_{a} : μ < 15$
4) $H_{0} : μ = 15$
$H_{a} : μ \neq 15$

scottyqegi 2021-11-30

Ali Baba's Car Wash Service Centre is open 6 days a week, but its busiest day is always on Sunday. From the previous data, Ali Baba estimates that dirty cars arrive at the rate of one every two minutes, One car at a time is cleaned in this example of a single-channel waiting line. Assuming Poisson arrivals and exponential service times, find the following:
Calculate the value of probability that there are no car in the system.

Tammy Fisher 2021-11-30

The display provided from technology available below results from using data for a smartphone carriers

Sherry Becker 2021-11-30

During different times of a day find the temperature in your place (you can use weather application to get data).
a. Fill the following table:
$\begin{array}{cc} Data of day & 1 / 9 / 2020 n i z w a \\ T i m e & A t 1 : 00 a m & A t 5 : 00 a m & A t 9 : 00 a m & A t 1 : 00 a m & A t 5 : 00 a m & A t 9 : 00 a m \\ T e m p e r a t u r e^{\circ} C & 26 & 25 & 31 & 37 & 37 & 31 \end{array}$
b. Calculate all central tendency measurements of the temperature.
c. Calculate standard deviation of the temperature.

Antinazius 2021-11-29

Find the range and standard deviation of the set of data.
11,9,7,11,12

gainejavima 2021-11-29

In a dataset, X is the independent variable, and Y is the dependent variable. Which of the following statement is correct?
1) Scatter plot between X and Y helps to see the pattern of the data spread.
2) Scatter plot between X and Y helps to find the regression line.
3) None of these
4) Scatter plot between, X and Y helps to find the value of r.
In a dataset, X is the independent variable, and Y is dependent variable, and r is Karl Pearson's coefficient of correlation. If $r = 0.099$ then
1) None of these
2) there is a weekly positive correlation between X and Y.
3) There is no correlation between X and Y.
4) There is a strongly positive correlation between X and Y.

hroncits8y 2021-11-29

Suppose that the random variable X is defined as $X = 0.6 X_{1} + 0.3 X_{2} + 0.1 X_{3}$ , where the probability distributions of the independent random variables $X_{1}, X_{2}, and X_{3}$ are
$f_{X 1} (x) = (\begin{matrix} 5 \\ x \end{matrix}) {0.1}^{x} \times {0.9}^{5 - x}$
$f_{X 2} (x) = (\begin{matrix} 5 \\ x \end{matrix}) {0.4}^{x} \times {0.6}^{5 - x}$
$f_{X 3} (3) = (\begin{matrix} 5 \\ x \end{matrix}) {0.6}^{x} \times {0.4}^{5 - x}$
$x = 0, 1, 2, 3, 4, 5$
a) Evaluate the mean of X.
b) Evaluate the variance of X.

europaparksn 2021-11-29

Consider a data set that has a mean of 17 and a standard deviation of 5.7. According to Chebyshevs

Ann Tice 2021-11-29

The mean number of birth of babies over a 5 month period in lbri is 112 and the coefficient of variation of the data is 3.72%. Find the standard deviation of the data.
1) 5.6664
2) 4.1664
3) 5.1664
4) 3.1664

xnlghtmarexgo 2021-11-29

Pedro has a box that contains various numbers of wooden shapes. He randomly draws out a shape and then places it back in the box. He repeats this process for a total of 36 times. The table shows his data.
Experimental Data for Shapes
$\begin{array}{cc} S h a p e & Number of Times Drawn Out \\ S p h e r e & 6 \\ C u b e & 4 \\ Square pyramid & 12 \\ Triangular prism & 14 \end{array}$
Based on the data, what is the probability that the next shape he draws from the box is a square pyramid?
1) $\frac{1}{9}$
2) $\frac{2}{9}$
3) $\frac{1}{3}$
4) $\frac{2}{3}$

Lloyd Allen 2021-11-29

The average price for a gallon of gasoline in the United States is $3.73 and in Russia it is $3.40 (Bloomberg Businessweek, March 5-March 11, 2012). Assume these averages are the population means in the two countries and that the probability distributions are normally distributed with a standard deviation of $.25 in the United States and a standard deviation of $.20 in Russia.
What percentage of the gas stations in Russia charge less than $3.50 per gallon?

krypsojx 2021-11-29

The following data reprents the age (in weeks) at which babies first crawl based on a survey of 14 mothers.
52,30,44,35,39,26,47,37,56,26,39,28,38,34
Construct and interpret a 90% confidence interval for the mean age at which a baby first crawls.

Lloyd Allen 2021-11-29

Fit the curve of the form $y = a b^{x}$ to the following data, then find the standard deviation.
$\begin{array}{cc} x & 3 & 4 & 5 & 6 & 7 \\ y & 1.8 & 2.5 & 3.6 & 4.7 & 6.6 \end{array}$

veudeje 2021-11-29

The city of Alameda is surveying residents to learn the proportion of smartphone users. They know that only smartphones use data. They sampled active cellphone plans from five service provider to determine the proportion that include data in the plan. Below are the results. What is the approximate confidence interval at 95% confidence level for population proportion of smartphones to cell phones?
$\begin{array}{cc} All cell phones (thousands) & Smartphones (thousands) \\ 100 & 71 \\ 120 & 90 \\ 87 & 87 \\ 54 & 69 \\ 67 & 65 \end{array}$
1) The survey indicates that 85% to 93% of cell phone plans include data for a smartphone.
2) The survey shows that 88% to 93% of subscribers to a cell phone plan own a smartphone.
3) The survey shows that 86% to 92% of cell phone plans include data for a smartphone.
4) The survey shows that 91% to 94% of subscribers to a cell phone plan own a smartphone.

achieverh3 2021-11-29

You have an unfair coin: the probability that it comes up heads on a single toss is 0.3. You offer to play a game with a friend. If it comes up heads twice in a row, you give them $1. If it doesn't, they give you $4. What are your expected winnings in this game? (Remember that winnings can be positive or negative!)

gamau6v 2021-11-29

If an experiment involves: a) a random sample of size n is selected without replacement from N items, and b) of the N items, k may be classified as successes and $N - k$ are classified as failures, this falls under:
a. negative binomial
b. geometric
c. poisson
d. hypergeometric

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