1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
erastova [34]
3 years ago
12

A bank is experimenting with programs to direct bill companies for commercial loans. They are particularly interested in the num

ber of errors of a billing program. To examine a particular program, a simulation of 1000 typical loans is run through the program. The simulation yielded a mean of 4.6 errors with a standard deviation of 0.5. Consturct a 95% confidence interval on the true mean error rate.
Mathematics
2 answers:
larisa [96]3 years ago
8 0

Answer:

95% confidence interval on the true mean error rate = [4.57 , 4.63] .

Step-by-step explanation:

We are given that to examine a particular program, a simulation of 1000 typical loans is run through the program.                                                         The simulation yielded a Mean,Xbar = 4.6 errors with a Standard deviation,s = 0.5.

Since, here we know nothing about population standard deviation so we will use t statistics quantity here i.e.;

                       \frac{Xbar-\mu}{\frac{s}{\sqrt{n} } } ~ t_n_-_1  where, Xbar = sample mean

                                                              s    = sample standard deviation

                                                              n  = sample size(no. of simulations)

                                                              \mu = population mean or true mean

So, 95% confidence interval on the true mean error rate is given by;

P(-1.96 < t_9_9_9 < 1.96) = 0.95 {because at 5% significance level t table gives

                                                  value close to 1.96}

P(-1.96 < \frac{Xbar-\mu}{\frac{s}{\sqrt{n} } }  < 1.96) = 0.95

P(-1.96 * \frac{s}{\sqrt{n} } < Xbar - \mu < 1.96 * \frac{s}{\sqrt{n} } ) = 0.95

P(-Xbar - 1.96 * \frac{s}{\sqrt{n} } < -\mu < Xbar - 1.96 * \frac{s}{\sqrt{n} } ) = 0.95

P( Xbar - 1.96 * \frac{s}{\sqrt{n} } < \mu < Xbar + 1.96 * \frac{s}{\sqrt{n} } ) = 0.95

95% Confidence interval for \mu = [Xbar - 1.96 * \frac{s}{\sqrt{n} } , Xbar + 1.96 * \frac{s}{\sqrt{n} } ]

                                                  = [4.6 - 1.96*\frac{0.5}{\sqrt{1000} } , 4.6 + 1.96*\frac{0.5}{\sqrt{1000} } ]

                                                  = [4.57 , 4.63]

Therefore, 95% confidence interval on the true mean error rate is        [4.57 , 4.63] .

Evgesh-ka [11]3 years ago
7 0

Answer:

The 95% confidence interval for true mean error is (4.57, 4.63).

Step-by-step explanation:

Let <em>X</em> = the number of errors of a billing program.

According to the Central limit theorem if a large sample (<em>n</em> > 30) is drawn from an unknown population then the sampling distribution of the sample mean will follow a Normal distribution with mean (\mu_{\bar x}=\mu) and standard deviation      (\sigma_{\bar x}=\frac{\sigma}{\sqrt{n}}).

The sample size of the loans is, <em>n</em> = 1000.

The mean is, {\bar x}=4.6.

The standard deviation is,  \sigma_{\bar x}=\frac{0.50}{\sqrt{1000}}=0.016

The confidence interval for mean is:

CI=\bar x\pm z_{\alpha /2}\times \sigma_{\bar x}

The critical value of <em>z</em> for 95% confidence interval is:

z_{\alpha /2}=z_{0.05/2}=z_{0.025}=1.96

**Use the <em>z</em>-table for critical values.

Compute the 95% confidence interval for true mean error as follows:

CI=\bar x\pm z_{\alpha /2}\times \sigma_{\bar x}\\=4.6\pm1.96\times0.016\\=4.6\pm0.03136\\=(4.56864, 4.63136)\\\approx(4.57, 4.63)

Thus, the 95% confidence interval for true mean error is (4.57, 4.63).

You might be interested in
Interpret a result. Use the distributive property to find the area of the figure at right. Write your multiplication and additio
Lyrx [107]
Lif if if nfdoig dsjg ienger ioqe o;gj er.
6 0
2 years ago
The perimeter of the figure below is 179.3 ft. Find the length of the missing side.
antoniya [11.8K]

Answer:

13 ft

Step-by-step explanation:

8(13.3) + 2(23.8) + 12.3 = 166.3

179.3 - 166.3 = 13

4 0
3 years ago
Read 2 more answers
For this question you will need to analyze data given in file seed Emergence. For your convenience, the data is posted as a text
Mrac [35]

Answer:

A) You will get the Mean, Sample variance and standard deviation, Minimum, maximum, range, and Boxplot.

B) The two-way ANOVA (analysis of variance) model is used for the two factors.

C) Outputs are obtained

D) Here, P-value (= 0.0377) < α (= 0.05). There is evidence that the treatments differ with respect to emerging plants.

Step-by-step explanation:

(A)  

Use the MegaStat add-in in Excel to draw the boxplot and to find; the group counts, means, standard deviations, variances, minimums, maximums, and ranges for the 5 treatment groups.

In another Excel worksheet. Enter the data in 5 different columns, each column representing a treatment, and the first row holding the treatment names.

Go to Add-Ins > MegaStat > Descriptive Statistics.

Enter Sheet1!$A$1:$E$5 in Input range.

Tick on Mean, Sample variance and standard deviation, Minimum, maximum, range, and Boxplot.

Click OK.

(B)

Since there are two factors affecting the outcomes- the five treatments (Control, Arasan, Spergon, Semesan, and Fermate), and the four blocks, the two-way ANOVA (analysis of variance) model must be used.

(C)

We have used the Data Analysis tool-pack in Excel to construct the analysis of variance table.

We have arranged the data and entered it as follows:

              Control,    Arasan,    Spergon,    Semesan,    Fermate

Block 1:        86           98             96               97              91

Block 2:       90           94             90               95              93

Block 3:       88           93             91                91               95

Block 4:       87           89             92               92              95

Go to Data > Data Analysis > Anova: Two-Factor Without Replication > OK.

In Input Range, enter $A$1:$E$6; tick on labels, enter Alpha as 0.05, and click OK.

The following output is obtained. Note that the analysis of variance table is given under “ANOVA” in the output.

(D)

In the analysis of variance table above, the “Rows” under “Sources of Variation” correspond to the treatments (as the observations under each treatment are noted along a row), whereas the “Columns” title relates to the block effects.

The P-value for Rows, hat is, for the treatments is 0.0377 (4 decimal places).

The level of significance is given as α = 0.05.

In this case, the null hypothesis is that, there is no significant difference between the 5 treatments, and the alternative hypothesis should be that, not all the treatments have the same effect.

The rejection rule for a test using the P-value is: Reject the null hypothesis, if P-value ≤ α. Otherwise, fail to reject the null hypothesis.

5 0
2 years ago
What is 9% of 42 pls help fast!
joja [24]

Answer:

3.78

Step-by-step explanation:

Percentage solution with steps:

Step 1: We make the assumption that 9 is 100% since it is our output value.

Step 2: We next represent the value we seek with $x$.

Step 3: From step 1, it follows that $100\%=9$.

Step 4: In the same vein, $x\%=42$.

Step 5: This gives us a pair of simple equations:

$100\%=9(1)$.

$x\%=42(2)$.

Step 6: By simply dividing equation 1 by equation 2 and taking note of the fact that both the LHS

(left hand side) of both equations have the same unit (%); we have

$\frac{100\%}{x\%}=\frac{9}{42}$

Step 7: Taking the inverse (or reciprocal) of both sides yields

$\frac{x\%}{100\%}=\frac{42}{9}$

$\Rightarrow x=466.67\%$

Therefore, $42$ is $466.67\%$ of $9$.

4 0
3 years ago
Read 2 more answers
Original price: $66; Markup: 20% The retail price is ?
andrezito [222]

Answer:

$79.20

Step-by-step explanation:

20% of $66 = $13.20

$66 + $13.20 = $79.20

4 0
3 years ago
Read 2 more answers
Other questions:
  • A sea bird is28 meters above the surface . what is its elevation?
    9·1 answer
  • PLEASE HELP QUICK!!!! What is the solution to the equation Two-thirds x + 1 = one-sixth x minus 7? x = negative 16 x = negative
    10·2 answers
  • In a certain town 60% of the households own mutual funds, 40% own individual stocks, and 20% own both mutual funds and individua
    15·1 answer
  • Which of these constructions is impossible using only a compass and straightedge?
    14·1 answer
  • The school's production of Romeo and Juliet began at 7:30 P.M. The first act lasted 1 hour and 45 minutes. The act was followed
    14·2 answers
  • The equation P=31+1.75w models the relation between the amount of Tuyet’s monthly water bill payment, P, in dollars, and the num
    14·1 answer
  • 7 4/6+1/3−5/6= <br> in fraction thank you
    10·2 answers
  • 1/5 ( 3x + 1/2 ) <br> expand the following expression
    5·2 answers
  • Evaluate a + b when a = -15 and b = -7.
    6·1 answer
  • Assume the probability is 1/2 that a child born at any time is a boy and births are independent. What is the probability of the
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!