nousc12.73 (M3, M4, M5, P1)How much money do people spend on graduation gifts?In 2016, the National Retail Federation (www.nrf.com)surveyed 2511 consumers who reported that they boughtone or more graduation gifts in 2016. The sample wasselected to be representative of adult Americans who pur-chased graduation gifts in 2016. For this sample, the meanamount spent per gift was $53.73. Suppose that the samplestandard deviation was $20. Construct and interpret a 98%confidence interval for the mean amount of money spentper graduation gift in 2016.

Given data normally distributed with mean of $53.73, sample standard deviation of $20 and sample…

Answered: nousc 12.73 (M3, M4, M5, P1) How much…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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A professor using an open-source introductory statistics book predicts that 60% of the students will purchase a hard copy of the book, 25% will print it out from the web, and 15% will read it online. She has 200 students this semester. Assuming that the professor's predictions were correct, calculate the expected number of students who read the book online.
r ps://www.capit. State Water Reso... New Tab 5 https://usonyc.ta... The National Longitudinal Study of Adolescent Health interviewed several thousand teens (grades 7 to 12). One question asked was "What do you think are the chances you will be married in the next 10 years?" Here is a two-way table of the responses by gender: Opinion Almost no chance Some chance but probably not A 50-50 chance A good chance. Almost certain Female Male 129 115 145 185 427 498 739 710 1188 756 a. How many individuals are described in this table? b. How many females were among the respondents? c. The percent of females among the respondents was about d. Your percent from the previous exercise is part of O the marginal distribution of sex. O the marginal distribution of opinion about marriage. O the conditional distribution of sex among adolescents with a given opinion. e. What percent of females thought that they were almost certain to be married in the next 10 years?
According to a retail organization, holiday shoppers spent an average of $935.58 over the Thanksgiving weekend in 2016. The accompanying data show the amount spent by a random sample of holiday shoppers during the same weekend in 2017. $1,029 $875 $969 $838 $825 $813 $962 $1,032 $990 $996 $921 $664 $1,013 $1,030 $979 $878 Complete parts a through c. Test the hypothesis that shoppers spent less than an average of $935.58 over the Thanksgiving weekend in 2017 using α=0.05.
A notebook computer dealer mounts a new promotional campaign. Purchasers of new computers may, if dissatisfied for any reason, return them within 2 days of purchase and receive a full refund. The cost to the dealer of such a refund is $125. The dealer estimates that 18% of all purchasers will, indeed, return computers and obtain refunds. Suppose that 90 computers are purchased during the campaign period. Complete parts a. and b. below. a. Find the mean and the standard deviation of the number of these computers that will be returned for refunds. The mean, µ, is: (Round to one decimal place as needed.)
Researchers wondered whether the size of a person's brain was related to the individual's mental capacity. They selected a sample of 3 females and 3 males and measured their MRI counts and IQ scores. The data is reported on the right. Females Males MRI IQ MRI 10 866,664 132 965,355 132 790,620 135 1,001,121 141 856,473 141 1,079,550 135 O Treat the MRI count as the explanatory variable. Compute the linear correlation coefficient between MRI count and IQ for both the males and the females. Do you believe that MRI count and IQ are linearly related? The linear correlation coefficient for females is. The linear correlation coefficient for males is. (Round to three decimal places as needed.) Are MRI count and IQ linearly related? linear The linear correlation coefficient for females is close to ▼so relation exists between MRI count and IQ for females. The linear correlation coefficient for linear relation exists between MRI count and IQ males is close to for males. SO
You may need to use the appropriate appendix table or technology to answer this question. According to the Vivino website, suppose the mean price for a bottle of red wine that scores 4.0 or higher on the Vivino Rating System is $32.48. A New England-based lifestyle magazine wants to determine if red wines of the same quality are less expensive in Providence, and it has collected prices for 65 randomly selected red wines of similar quality from wine stores throughout Providence. The mean and standard deviation for this sample are $30.15 and $12, respectively. (d) Repeat the preceding hypothesis test using the critical value approach. State the null and alternative hypotheses. (Enter != for ≠ as needed.) H0: Ha: Find the value of the test statistic. (Round your answer to three decimal places.) State the critical values for the rejection rule. Use ? = 0.05. (Round your answers to three decimal places. If the test is one-tailed, enter NONE for the unused tail.)…
Only letters C and D
Secretary of State Roxana Tillerson is worried about malpractice at the 4 processing centers for Green Cards in the country. Green Card applications are given a grade g on a scale 0-100. They are assigned randomly to different centers and thus Tillerson expects all centers to have similar mean scores. She collects the data in the table. #applications 9360 67.27 15.29 1 9870 66.74 14.64 7020 66.94 15.14 3 5040 67.02 14.84 4 rows x 3 columns At this point she just wants to decide whether or not to initiate a deeper investigation into malpractice at all sites. Does she have sufficient evidence for this, at 6% significance? SSTT number (rtol=0.01, atol=0.0001) SSE number (rtol=0.01, atol=0.0001) F. number (rtol=0.01, atol=0.0001) P-val number (rtol=0.01, atol=0.0001) O (a) No, she cannot make a conclusion O (b) Yes, she has enough evidence Select the key assumptions in the test you used. O (a) The populations are independent and therefore their covariances are zero. O (b) All sample sizes…
Please answer all the questions in literal b
The 2008 general social survey asked a nationally representative sample of 1324 adult americans to report how many hours of television they watch in a typical day. The resulting data are reported in the following table counts. What is the mean numbers of hours of tv watched?
From candy to jewelry to flowers, the average consumer was expected to spend $104.63 for Mother’s Day in 2005, according to a Democrat & Chronicle article. Local merchants thought this average was too high for their area. They contracted an agency to conduct a study. A random sample of 60 consumers was taken at a local shopping mall the Saturday before Mother’s Day and produced the sample mean amount of $94.27. If σ = $29.50, does the sample provide sufficient evidence to support the merchants’ claim at the 0.03 level of significance? 1. Do you recognize any flaws in this study and what conclusions can you draw? The article “Well-fed Crickets Bowl Maidens Over” reports that female field crickets are attracted to males that have high chirp rates and hypothesized that chirp rate is related to nutritional status. The usual chirp rate doe male field crickets was reported to vary around a mean of 60 chirps per second. To investigate whether chirp rate was related to nutritional…
The number of credits being taken by a sample of 13 full-time college students are listed below. Find the mean, median, and mode of the data, if possible. If any measure cannot be found or does not represent the center of the data, explain why. 88 11 11 8 9 77777 7 10 TMV UIG TIHVUG. VGIGLIUIG COITGGL GITVIGG VGIVW aiIU, II TIGL655aiy, mI MUIG QISWGI VUX LU Compitic yoUr GilviG. O A. The mode(s) is/are (Type an integer or decimal rounded to one decimal place as needed. Use a comma to separate answers as needed.) O B. The data set does not have a mode. Does (Do) the mode(s) represent the center of the data? O A. The mode(s) represent(s) the center. O B. The mode(s) does (do) not represent the center because it (one) is the largest data value. O C. The mode(s) does (do) not represent the center because it (one) is the smallest data value. O D. The mode(s) does (do) not represent the center because it (they) is (are) not a data value. O E. The data set does not have a mode.

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