A business consultant wanted to investigate if providing day care facilities on premises by companies reduces the absentee rate of working mothers from companies that provide day care facilities on premises. Sample of 50 mothers selected from the companies that provide day care facilities was taken. These mothers missed an average of 6.4 days from work last year with a standard deviation of 1.20 days. Another sample of 50 such mothers taken from companies that do not provide day care facilities on premises showed that these mothers missed an average of 9.3 days last year with a standard deviation of 1.83 days. Construct a 98 % confidence interval for the difference between the two population means

Q: A shareholders' group is lodging a protest against your company. The shareholders group claimed that…

A: the share holders group claimed that the mean tenure for  ceo was less than 11 years

Q: The town of KnowWearSpatial, U.S.A. operates a rubbish waste disposal facility that is overloaded if…

A: It is given that the mean is 26.84 and the standard deviation is 12.17 and the sample size is 5,052.

Q: The time required for an automotive center to complete an oil change service on an automobile…

A:

Q: For this frequency districution find the: A. Sample Mean B.Sample standard deviation

A: We have given frequency distribution and we have to find the sample mean and sample standard…

Q: Suppose a researcher is planning a step-by-step smoking cessation program aimed at youth aged 16-18…

A: Null hypothesis:   H0: µ≥20   That is, the cassation program is not working.   Alternative…

Q: The 25 students in our class sleep 7.5 hours on average. We also have the information that European…

A: Given Information: Sample size n=25 Sample mean x¯=7.5 Hypothesized value of population mean is…

Q: You receive an inheritance of $12,500, and you place the full amount into a bank account. The bank…

A: Given that : Principle P = $12500 Rate R = 7.5% Time T = 1 Year

Q: According to a report released by CIBC entitled "Women Entrepreneurs: Leading The Charge, "average…

A: Given: The population standard deviation σ=8.95 The Sample size is n=97 The sample mean X¯=43.4…

Q: In recent days online version of different toys are receiving popularity among the customers.…

A:

Q: notive center guarantees customers that the service will take no longer than 20 minutes. If it does…

A: X~N( μ , ?)   μ=17 , ?=2.5   Z-score =( x - μ )/?

Q: In a mid-size company, the distribution of the number of phone calls answered each day by each of…

A: Given,mean(μ)=53standard deviation(σ)=5Empirical rules:1) P(μ-σ<X<μ+σ)=68%2)…

Q: The Fair Isaac Corporation (FICO) credit scoreis used by banks and other lenders to determine…

A:

Q: A company produces high quality and long lasting batteries for cars. The CEO of the company claims…

A: Given : sample size, n =45 sample mean, x̄ =260 population standard deviation,σ=50…

Q: In order to test average litter size for different breeds, a sample of 25 litter sizes was taken…

A:

Q: A shareholders' group is lodging a protest against your company. The shareholders group claimed that…

A: Introduction: Large sample test for the population mean test of significance for a testing single…

Q: A marketing group is trying to improve sales for a clothing retail store, but first they are trying…

A: It is given that  Mean, μ = 26.7 Standard deviation, σ = 3.9

Q: h individual lines at its various windows, a post office finds that the standard deviation for…

A: The SD for waiting times of customers is 3.97 minutes;σ=3.97 A random sample of 14 customers with…

Q: Are severe psychiatric disorders related to biological factors that can be physically observed? One…

A: Solution: Given information: n1=10 Sample size of patients with obsessivecompulsive disordersn2=10…

Q: A large electronics company requires each agent to visit a store that sells its products at least 20…

A: Population mean is Sample mean is .Sample size is Sample standard deviation is .Level of…

Q: The town of KnowWearSpatial, U.S.A. operates a rubbish waste disposal facility that is overloaded if…

A: Given data normal diaatributionμ = 26.88 lbσ = 12.74 lbn = 5028over load if x¯ >27.37

Q: Data were collected on annual personal time (in hours) taken by a random sample of 16 women and 7…

A: Independent t-testThe independent sample t-test is used to compare two sample means from unrelated…

Q: 4. A company produces an electric toothbrush with a life (that time period for which it does not…

A:

Q: A survey found that​ women's heights are normally distributed with mean 62.2in. and standard…

A: Men mean =67.7 s = 3.5

Q: The customers at a bank complained about long lines and the time they had to spend waiting for…

A: Given that Sample size n = 61 Sample mean = 10.2 Sample SD = 2.9 Level of significance = 0.5% =…

Q: A potato chip manufacturer was building a new manufacturer plant and tgey were trying to decide…

A: Solution

Q: It appears that people who are mildly obese are less active than leaner people. One study looked at…

A: (a) Obtain the probability that the mean number of minutes of daily activity of the 5 mildly obese…

Q: A shareholders' group is lodging a protest against your company. The shareholders group claimed that…

A: Solution: State the hypotheses. Null hypothesis: H0: µ≥10 That is, the population mean tenure for…

Q: A manufacturer of plasma has determined that the televisions require servicing after a mean of 67…

A: Let x be the length of warranty should be offered which follows normal distribution with mean 67 and…

Q: The time required for an automotive center to complete an oil change service on an automobile…

A: The Z-score of a random variable X is defined as follows: Z=(X–µ)/σ Here, µ and σ are the mean and…

Q: The automotive center guarantees customers that the service will take no longer than 20 minutes. If…

A: We have given that  Mean=17min Standard deviation=2.5min X~Normal(mean=17,Standard deviation=2.5)

Q: A newly hired human resource analyst proposes to senior management that the number of employee sick…

A:

Q: Although many people think they can put a meal on the table in a short period of time, a recent…

A: The objective of this question is to determine whether there is statistical evidence that the…

Q: The time required for an automotive center to complete an oil change service on an automobile…

A: For the distribution of the oil change completion time at the automotive center, it is specified…

Q: According to a leasing firm's reports, the mean number of miles driven annually in its leased cars…

A: a)   Denote μ as the population mean number of miles driven annually under the new contracts.

Q: A newly hired human resource analyst proposes to senior management that the number of employee sick…

A:

Q: In a mid-stze company, the distribution of the number of phone calls answered each day by each of…

A:

Q: hours of personal time per year with a standard deviation of 3.29 hours. The Human Resources…

A: It is given ast = 2.00P-value = 0.0367Significance level, α = 0.05

Estimation

A new framework of data analysis where the new statistical methods are used for interpreting the results and analyzing the data is known as estimation in statistics.