A manufacturer wishes to estimate the proportion of washing machines leaving the factory that is defective. How large sample should she check in order to be 90% confident that the true proportion is estimated to within 2.4%? OA 1668 O B. 1175 OC. 11512 O D. 911 OE Not enough information is given.

Q: Students at Neilson Middle School are asked if they prefer watching television or listening to the…

A: Given that, The total number of students at Neilson Middle School is 150. The number of students,…

Q: A recent poll of 800 people who work indoors found that 208 of them smoke. If the researchers wnat…

A: The sample proportion can be calculated as: p=x/n=208/800=0.26 At a 98% confidence level, the z…

Q: When estimating the population proportion, how large a sample is needed to be 95% confident that the…

A: Given:  The margin of error is equal to 0.05  Confidence Level : 95%  It is asked to compute the…

Q: A telemarketer calls people and tries to sell them a subscription to a daily newspaper. On 19% of…

A: Given  A telemarketer calls people and tries to sell them a subscription to a daily newspaper On 19%…

Q: Out of 1000 residents of Eagle County surveyed, 590 of them feel that their children receive a good…

A: There are two independent samples which are Eagle County and Beaver County. We have to construct 95%…

Q: A recent study indicated that 22% of the 173 women over age 55 in the study were widows. Round up…

A:

Q: A researcher at a major hospital wishes to estimate the proportion of the adult population of the…

A: Obtain the large sample size. The large sample size is obtained below as follows: Use EXCEL…

Q: d) What percentage of women are TALLER than 5 feet 11 inches? Round to nearest tenth of a percent. %…

A: Given Information: Mean height of adult men = 69.8 inches The standard deviation of height of adult…

Q: c. What is the power of the test in part a? d. How many animals should be included in the study to…

A: We have to find out the power of test of part a). From part a), Zcal = 1.3055 We know that, Power of…

Q: The owner of a local bar specializing in alternative music wanted to determine the average age of…

A: t 95% confidence level, the z value is 1.96 which can be obtained by using the standard normal…

Q: (b) What proportion of the strength observations are at least 85? Less than 95? (Round your answers…

A: b) i) The frequency for strength observations are at least 85 is 18+30+43+24+22+14+3=154.

Q: If you want to be 99​%confident of estimating the population proportion to within a sampling error…

A: GivenSampling Error(E)=0.06population proportion(p)=0.36confidence…

Q: d. What percentage of students scored at least 66? e. How many students scored more than 98 on the…

A:

Q: For a sample of size 300 from a population with the population proportion, p = 0.45, compute ?? ℎ??…

A: Consider that p is population proportion.

Q: Determine what proportion (n) of a population N of 4,000 will make your research work scientific in…

A: Given : Population Size (N) = 4000 Level of significance = 0.05 i.e Confidence level = 95% It means…

Q: A company wants to know the proportion of consumers willing to buy their product. How many people…

A: Given that ME=margin of error=1.5%=0.015z=critical value off 90% confidence…

Q: d) What proportion of people leave Vegas having lost between $200 and $800 (for a given year)?

A: (d) Obtain the Z-score for the random variable X equals 200. The Z-score for the random variable X…

Q: Use Table B to answer the following question. 1. What proportion lies to the right of z=0.25?

A: What proportion lies to the right of z=0.25? i.e. P(z>0.25)=?

Q: A researcher wishes to estimate the proportion of corporate executives whose annual salary is over…

A:

Q: Use Table B to answer the following question. 1. What proportion lies to the left of z=2.64?

A: Given that: Z is standard normal Distributed with i.e. mean µ =0 and standard deviation σ =1 By…

Q: s the newly hired manager of a company that provides cell phone service, you want to determine the…

A: It is given that margin of error (E) is 0.92 and the confidence level is 0.90.

Q: A researcher wishes to estimate the proportion of a fish in a certain lake that is inedible Due to…

A:

Q: When estimating the true proportion, how large a sample is needed to be 95% confident that the error…

A: It is given that Margin of error E = 0.06 Level of confidence = 0.95 The critical value of Z at 95%…

Q: a sample of ore is found to be 0.0012% diamond and 0.033% copper. What is the percentage of matter…

A: Given:- A sample of ore is found to be 0.0012% diamond and 0.033% copper To find:- The percentage of…

Q: For a z-score of Z = -2.2, give the proportion in the body (hint: use the z-table), and state…

A:

Q: In a random survey of 1500 adults in California and 1000 adults in Oregon, you found that 228…

A: Given that

Q: How many people do we need to sample? We would like to be within 3 percent of the actual answer and…

A:

Q: A researcher wishes to estimate the proportion of adult males who are less than 5 feet 5 inches…

A: It is given that margin of error (E) is 0.04 and the confidence level is 0.90.

Q: A sobriety test is 96% accurate. Suppose 2500 drivers were pulled over on suspicion ofintoxication,…

A: Given that the sobriety test is 96% accurate, 2500 drivers were pulled over on suspicion of…

Q: oward revisions in the health care system. The president wants the estimate to be within 0.02 of the…

A: The  population proportion (p) of people that supports  health care revisions is given as 0.61.  The…

Q: An educator desires to estimate, within 4%, the true percentage of high school students who study at…

A:

Q: A researcher wishes to estimate the proportion of adult males who are less than 5 feet 5 inches…

A: Given data,E = 45 - 0.04Ƶ -value at 90% confidence is Ƶc = 1.645

Q: Fill in the anova table   Source   SS   df   MS       F effect    500   2     ?          ? error…

A: Let K be the number of elements in effect N be the total number  Farmula used F=MSeffect/MSerror

Q: d) What percentage of women are TALLER than 5 feet 11 inches? Round to nearest tenth of a percent.…

A: formula for z-score is

Q: (a) What proportion of the population has scores below 27 on the Chapin test? D.15866 (b) What…

A: Since you have posted a question with multiple sub-parts, we will solve first three subparts for…

Q: A survey of 100 fatal accidents showed that 26 were alcohol related. Find a point estimate for p,…

A: Given information: Sample size of the survey of fatal accidents n=100 Number of accidents that were…

Q: The Humane Society is interested in finding out how many households in America have at least one…

A: The provided information are: Confidence level = 95% = 0.95 Margin of error (E) = 4% =0.04 From the…

Q: How large a sample must she select if she desires to be 98% confident that the true mean is within 4…

A: HERE GIVEN , population standard deviation  = 6 ounces  confidence level = 98%  MOE  = 4

Q: s comprise 65% of trees in the first orchard and 45% of trees in ards combined. What percentage of…

A: Let the number of trees in the first orchard be x and the number of trees in the second orchard be…

Q: A random sample of students was surveyed and asked to list their grade level and whether or not they…

A:

Q: What is the formula used to determine the proportion (P) of something in a sample population? ох in…

A: In proportion test estimate of the proportion is given as follows: p⏞=Xn Where X is number in the…

Q: Sleep Aids. The additional sleep, to the nearest tenth of an hour, obtained by a sample of 100…

A: Quantitative variable: A variable that provides numerical values of individual and Arithmetic…

Q: A sample of 1000 observations taken from population-1 gave x, =290 . Another 1 sample of size 1200…

A: We have given that,  For population:- 1 N1 = 1000, X1= 290, For population:- 2 N2 = 1200, X2 = 396…

Q: With no preliminary estimate of the proportion known, how many young adults would you survey to…

A: It is given that margin of error (E) is 0.10 and the confidence level is 0.99.

Q: f you want to be 99​% confident of estimating the population proportion to within a sampling error…

A: p = 0.42 z-critical value at alpha(0.01) is 2.576. ME = 0.05

Q: One researcher wants to estimate the proportion of MU students who are vegetarian, 6 answered "yes".…

A:

Q: You would like to be 99.9 confident that your estimate is within 2% of the true population…

A:

Q: A researcher claims that the proportion of cars with manual transmission is less than 10%. To test…

A: Given, Population proportion = P = 10% = 0.10 Sample size = n = 1000 x = 95 Sample proportion = p =…

Q: What percent of our campus is female? If no preliminary study is made to estimate, how large a…

A: Given that no preliminary sample is taken to estimate the proportion of females. let the sample size…

Contingency Table

A contingency table can be defined as the visual representation of the relationship between two or more categorical variables that can be evaluated and registered. It is a categorical version of the scatterplot, which is used to investigate the linear relationship between two variables. A contingency table is indeed a type of frequency distribution table that displays two variables at the same time.

Binomial Distribution

Binomial is an algebraic expression of the sum or the difference of two terms. Before knowing about binomial distribution, we must know about the binomial theorem.