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bazaltina
3 months ago
12

A company surveyed 100 newer employees. These employees were chosen at random from the company's database, and only employees wi

th less than one year on the job were selected. Employees were asked the question, "Do you want the company to offer more sick days or more vacation days?" A report of the survey results stated that employees prefer more vacation days than sick days. Select all statements that correctly evaluate the report.
A. The sample is biased because it does not represent the population of all employees.

B. The question is biased toward a response of preferring more sick days.

C. The sample is not biased.

D. The question is biased toward a response of preferring more vacation days.
E. The question is not biased.
Mathematics
1 answer:
lawyer [12.5K]3 months ago
3 0

Answer:

A, E

Step-by-step explanation:

The query is neutral, lacking any positive or negative bias. Nonetheless, the sample itself displays bias as it only includes new employees, failing to represent all individuals in the company.

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What are the solutions of the equation x4 + 6x2 + 5 = 0? Use u substitution to solve.
tester [12383]

The solutions to the equation are x=\pm i, x=\pm \sqrt{5}i

Explanation:

Given the equation x^{4}+6 x^{2}+5=0

, we aim to find the solutions of the equation.

Let us use x^{2} =u and x^4=u^2

Thus, the equation transforms into

u^{2}+6 u+5=0

Factoring the equation results in:

(u+1)(u+5)=0

      u=-1, u=-5

Inserting back x^{2} =u and allows us to solve for x.

Initially, we will substitute u=-1

Consequently, we find;

x^{2} =-1

x=\sqrt{-1}

x=\pm i

Similarly, by substituting u=-5, we derive;

x^{2} =-5

x=\sqrt{-5}

x=\pm \sqrt{5}i

Thus, the solutions to the equation are x=\pm i, x=\pm \sqrt{5}i

6 0
1 month ago
A 95% confidence interval for the population proportion of professional tennis players who earn more than 2 million dollars a ye
Svet_ta [12734]

Response:

e. 545

Detailed explanation:

In a survey sample containing n individuals, with a success probability of \pi, and a confidence level of 1-\alpha, the ensuing confidence interval for proportions is established.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

Wherein

z denotes the z-score corresponding to a probability value of 1 - \frac{\alpha}{2}.

For this scenario, we find:

The estimate averages the two bounds. Thus \pi = \frac{0.82+0.88}{2} = 0.85

95% confidence level

Consequently, z represents the z value corresponding to the p-value of 1 - \frac{0.05}{2} = 0.975, hence Z = 1.96.

The lower boundary of this interval is:

L = \pi - z\sqrt{\frac{\pi(1-\pi)}{n}}

In this query, L = 0.82. Therefore

0.82 = 0.85 - 1.96\sqrt{\frac{0.85*0.15}{n}}

1.96\sqrt{\frac{0.85*0.15}{n}} = 0.03

0.03\sqrt{n} = 1.96\sqrt{0.85*0.15}

\sqrt{n} = \frac{1.96\sqrt{0.85*0.15}}{0.03}

(\sqrt{n})^{2} = (\frac{1.96\sqrt{0.85*0.15}}{0.03})^{2}

n = 544.23

Thus, the accurate response is:

e. 545

4 0
1 month ago
The positive difference between the two roots of the quadratic equation $3x^2 - 7x - 8 = 0$ can be written as $\frac{\sqrt{m}}{n
Svet_ta [12734]

3x² - 7x - 8 = 0

Since we need to calculate square roots, we'll skip factoring and directly apply the quadratic formula,

x = ( 7 ± √(7² - 4(3)(-8))    )/(2(3)) = (7 ± √(49+96))/6 = 7/6 ± √145/6

145 = 5×29, indicating there are no square factors. The positive difference is

d =  (7/6 + √145/6) - (7/6 - √145/6) = 2√145/6 = √145/3

therefore, m=145, n=3 leading to a sum of

Answer: 148

3 0
2 months ago
Read 2 more answers
Cheese costs $4.40 per pound. Find the cost per kilogram. (1kg = 2.2lb)
AnnZ [12381]

Answer:

The price amounts to $9.70 per kilogram.

Step-by-step explanation:

This can be resolved using the rule of three.

In a rule of three scenario, the first step involves determining how the values are related, whether directly or inversely.

A direct relationship implies that when one measure increases, the corresponding measure also increases. In this case, cross multiplication serves as the method for the rule of three.

Alternatively, an inverse relationship indicates that an increase in one measurement causes a decrease in the other. In this scenario, line multiplication applies.

Here, the relationship is between the weight of the cheese and its cost. As the weight rises, so does the expense, representing a direct proportion.

Solution:

According to the problem, cheese is priced at $4.40 per pound. Given that each kg equals 2.2 pounds, we can deduce how many kg correspond to one pound.

1 pound - x kg

2.2 pounds - 1 kg

2.2x = 1

x = \frac{1}{2.2}

x = 0.45 kg

Given that cheese costs $4.40 for a pound, and there are 0.45 kg in one pound, we calculate the cost for 1 kg.

$4.40 - 0.45 kg

$x - 1 kg

0.45x = 4.40

x = \frac{4.40}{0.45}

x = 9.70

The price is $9.70 per kilogram.

6 0
3 months ago
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