Practice Math Statistics Problems and Master the Concepts

In an exit poll during the 2004 presidential election, voters were asked to name the issue that most affected their vote for a candidate for presidency. The following table summarizes their responses.
Moral Values: 22%
Economy/jobs: 20%
Terrorism: 19%
Iraq: 15%
Health Care: 8%
Taxes: 5%
Education: 4%
As you will notice, these percentages add up to 93%. Assume that the remaining 7% of these voters names other issues and let us denote these issues as Other. Draw a bar graph to display these data.

Ramsey 2021-01-06

Two different analytical methods were used to determine residual chlorine in sewage effluents. Both methods were used on the same samples, but each came from various locations, with differing amounts of contact time with the effluent. The concentration of Cl in mg//L was determined by the two methods, and the following results were obtained:
Method $A : 0.39, 0.84, 1.76, 3.35, 4.69, 7.70, 10.52, 10.92$
Method $B : 0.36, 1.35, 2.56, 3.92, 5.35, 8.33, 10.70, 10.91$
(a) What type of t test should be used to compare the two methods and why?
(b) Do the two methods give different results?
(c) Does the conclusion depend on whether the 90%, 95% or 99% confidence levels are used?

djeljenike 2021-01-06

Give the correct answer and solve given
a. Test for a difference in the means in the two populations using an $[α = .05 t - t e s t .]$
b. Place a 95% confidence interval on the difference in the means of the two populations.
c. Compare the inferences obtained from the results from the Wilcoxon rank sum test and the -test.
d. Which inferences appear to be more valid, inferences on the means or the medians?

Dottie Parra 2021-01-06

A weather forecaster predicts that the temperature in Antarctica will decrease $8^{\circ} F$ each hour for the next 6 hours. Write and solve an inequality to determine how many hours it will take for the temperature to drop at least $36^{\circ} F$

Joni Kenny 2021-01-06

Inference about cause and effect but cant

DofotheroU 2021-01-05

In each of the following situations, the sampling frame does not match the population, resulting in undercoverage. Give example of population members that might have been omitted.
a) The population consists of all 250 students in your laege statistics class. You plan to obtain a sample random sample of 30 students by using the sample frame of students present next Monday.
b) The population consists of all 15-year-olds living in the attendance district of a local high school. You plna to obtain a simple random sample of 200 such residents by using the student roster of the high school as the sampling frame.

Isa Trevino 2021-01-05

Use:
$F (x) = 0.2 ((x - 3)^{2}) (x + 1),$ bounded by the x axis, over [-1,2]
Use the limit definition of Riemman Sum to find the earea shaded beneath the curve, round to 3 decimal places.

Brennan Flores 2021-01-05

Give full and correct answer for this questions 1) A t-test is a ? 2) Which of the following statement is true? a)The less likely one is to commit a type I error, the more likely one is to commit a type II error, b) A type I error has occurred when a false null hypothesis has been wrongly accepted. c) A type I error has occurred when a two-tailed test has been performed instead of a one-tailed test, d) None of the above statements is true. 3)Regarding the Central Limit Theorem, which of the following statement is NOT true? a.The mean of the population of sample means taken from a population is equal to the mean of the original population. b. The frequency distribution of the population of sample means taken from a population that is not normally distributed will approach normality as the sample size increases. c. The standard deviation of the population of sample means is equal to the standard deviation of the, original population. d. The frequency distribution of the population of sample means taken from a population that is not normally distributed will show less dispersion as the sample size increases.

necessaryh 2021-01-05

The sample mean and population standard deviation are provided to you. Use this information to construct the $90 % and 95 %$ confidence intervals for the population mean. Interpret the results and compare the widths of the confidence intervals.
From a random sample of 66 dates, the mean record high daily temperature in a certain city has a mean of ${85.69}^{\circ} F$ . Assume the population standard deviation is ${13.60}^{\circ} F .$
The $90 %$ confidence interval is
The $95 %$ confidence interval is
Which interval is wider?
Interpret the findings.

cistG 2021-01-05

A study among the Piria Indians of Arizona investigated the relationship between a mother's diabetic status and the number of birth defects in her children. The results appear in the two-way table. $Diabetic status \begin{array}{llccc} Nondiabetic & Prediabetic & Diabetic \\ None & 754 & 362 & 38 \\ One or more & 31 & 13 & 9 \end{array}$

What proportion of the women in this study had a child with one or more birth defects?

Line 2021-01-05

A population of values has a normal distribution with $μ = 99.6$ and $σ = 35.1$ . You intend to draw a random sample of size $n = 84$ .
Find the probability that a sample of size $n = 84$ is randomly selected with a mean between 98.5 and 100.7.
$P (98.5 < \overset{―}{X} < 100.7) =$ ?
Write your answers as numbers accurate to 4 decimal places.

SchachtN 2021-01-05

If X and Y are random variables and c is any constant, show that $E (X - Y) = E (X) - E (Y)$ .

pedzenekO 2021-01-04

In a comparison between two. major brands of broiler chickens, 70 of 160 Perdue chickens in a SRS tested positive for food-borne illness bacteria. In a SRS of 160 Tyson chickens, 132 tested positive. Wed

lwfrgin 2021-01-04

Find the covariance $s_{x y}$ using bivariate data.

geduiwelh 2021-01-02

Given $f (x) = x^{2} + 3 x + 8$ , find the average rate of change of $f (x)$ over each of the following pairs of intervals.

Falak Kinney 2021-01-02

Solve the given Alternate Coordinate Systems and give a correct answer 10) Convert the equation from Cartesian to polar coordinates solving for $r^{2}$ :
$\frac{x^{2}}{9} - \frac{y^{2}}{16} = 25$

FizeauV 2021-01-02

Heights and mid-parent heights are given for 18 college students. Draw a scatterplot for the data, using different symbols for males and females as instructed in part (b). Based on the scatterplot, would you say that the correlation between height and mid-parent height is higher for the females in the sample or for the males? Or are the correlation values about the same for males and females?

Ayaana Buck 2021-01-02

The article "Modeling Sediment and Water Column Interactions for Hydrophobic Pollutants" (Water Research, $1984: 1169-1174$ ) suggests the uniform distribution on the interval (7.5,20) as a model for depth (cm) of the bioturbation layer in sediment in a certain region.
What are the mean and variance of depth?
b. What is the cdf of depth?
What is the probability that observed depth is at most 10? Between 10 and $15 ?$
What is the probability that the observed depth is within 1 standard deviation of the mean value? Within 2 standard deviations?

boitshupoO 2021-01-02

Explain how to will the mean and the median affected after correcting the score.
The instructor entered the test scores from statistics class of 25 students and calculated the mean and median of the scores. After checking it was discovered that the top score was entered wrong as 46 instead of 56.

postillan4 2021-01-02

Discuss the differences between quantitative and qualitative data, as well as the advantages and disadvantages of each?

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