請問第1題和第2題怎麼算呢？不太懂什麼時候需要使用自由度(df)

以後練習 ✓ 1. 100 位民眾之舒張壓平均數為73 mmHg,標準差s = 11.6 mmHg, 試計算p之95%CI及99% CI估計值是多少? ↓ 2. 100 筆地下水質監測資料,含As之平均濃度為0.15 mg/L,標準差 S= 0.2 mg/L,試計算 之 95% CI及 99% CI? 3. 若 38 名男性, = 74.9,S = 12;若 45 名女性, = 71.8,S, = 11;計算 - 之 95% CI 估計值是多少? 4. 若採樣 100 筆台中地區空氣中 PM.s濃度之X = 65 ug/m²,S = 10 ug/m²;若採樣 120 筆南投埔里地區空氣中PM 濃度之 = 80 ug/ m²,Sz = 15 ug/m²,請計算台中地區與埔里地區之 PM; 濃度差的 95% CI 估計值是多少? ading on aod teem

求問第25題 是要先轉置再高斯對嗎？🙏🙏🙏

行空間的基底和秩 在習題 21-26 中,求 (a) 行空間的基底和 (b) 矩陣的秩。 21. 23. 25. 2 4 6 1 2 4 1 4 - 1 2 2 7 4 14 22. [1 2 4 20 24.6 -5 2 -11-16 -3-6 -6-3 3] -2-4 1 - 2 24 -2 -2 31] -6

想問第42題

25. lim 8118 27. lim X18 A 29. lim 31. lim 33. lim √x - √√x x→→∞ √√√x + √√x 35. lim 2x²/3 - x1/3 + 7 xxx x8/5 + 3x + √x 37. lim x→∞ x + 1 39. lim x - 3 x→∞ √4x² + 25 1 x→0+ 3x 1-x² 2√x + x¹ 3x - 7 41. lim 1. 2 X-2 X- 43. lim √x² + 1 45. a. lim 3 2x x-8+ x + 8 + 7x 4 x→7 (x-7)² 2 2 46. a. lim x-0+ x1/5 4 2 x-0+ 3x¹/3 B Infinite Limits Find the limits in Exercises 37-48. Write ∞ or -∞ where appropriate. 5 x →0-2x x - 3x 26. lim√√³+x-2 b. lim 2 + √x x→∞ 2 - √x 28. lim 30. lim x¹ + x4 x-xxx-²-x-3 32. lim Vì - 5x + 3 x-∞ 2x + x2/3 - 4 34. lim 36. lim 2 x→0 3x¹/3 xxx +1 2 b. lim x→0 x1/5 4 - 3x3 x-∞ √6 +9 38. lim 40. lim √x² + 1 42. lim x-3x - 3 3x x-5-2x + 10 44. lim -1 x→0 x²(x + 1) 19 lime 1

普物下電學 想請問一下這兩題怎麼寫 沒有很懂題目在表達什麼 謝謝！

< EUR)- 2:30 10 4 Awes R 一個點電荷Q帶有多少電位能?要回答這個問題,我們可以先算出均勻帶電球(Example 22.9)的總 電位能,再將球半徑 R 趨近於零。 (a) 計算均勻帶電球的總電位能。 (b)推論一個點電荷Q帶有多少電位能- E- Or Amepl 91 90 HW5 P 47 3 附錄: (a)小題的兩種算法算法,可任選一方法計算- -R³ - Spherical insulator -Gassian surface Method 1. 假設一開始沒電荷,一次搬 dQ 的電量, 從無窮遠移過來,類似下圖四顆點電荷的例子, U=U₁+U₂+U₂ ~~ dU =Vdq = Method 2. dq=p4nr²dr = 10 4me7 47 Q₁.³ q(r)=p² -7.3 3 R³ q(r) Q-² V(r)= Amer 4eR = 假設電荷是一圈一圈的從無窮遠處移過來,列式如下, Q 30-² R³ dr = Q₁² 30₁.² 4лε R³ R³ 基本資訊 4 1 9091 +9092 +9093 +9192 +9193 +9293 Pol 102 103 112 113 123 1 -Σ² 4ME。 4.80 ky Py Ty ·dr =... (9.9元 II 4G 196 假設一開始電荷已經就位,計算所有電荷的電位能再除2,類似下圖四顆點電荷的例子, U = = Σ9V₁ 1-0 1 -9 寫作業

請問大一統計學這兩題有人看得懂嗎🥲

2. To study the attitude of mother and father towards their daughter participating in the outdoor games, a sample of 200 fathers and 250 mothers was investigated. In these two samples, 120 fathers and 50 mothers preferred their daughter to go for outdoor activities. Can it be concluded at a=0.01 level of significance that the proportion of father is significantly higher than that of mother in preferring their daughters for outdoor activities? 3. A firm has a generous but rather complicated policy concerning end-of-year bonuses for its lower-level managerial personnel. The policy's key factor is a subjective judgment of "contribution to corporate goals." A personnel officer took samples of 24 female and 36 male managers to see whether there was any difference in bonuses, expressed as a percentage of yearly salary. The data are listed here: Gender Bonus Percentage Female 9.2, 7.7, 11.9, 6.2, 9.0, 8.4, 6.9, 7.6, 7.4, 8.0, 9.9, 6.7, 8.4, 9.3, 9.1, 8.7, 9.2, 9.1, 8.4, 9.6, 7.7, 9.0, 9.0, 8.4 10.4, 8.9, 11.7, 12.0, 8.7, 9.4, 9.8, 9.0, 9.2, 9.7, 9.1, 8.8, 7.9, 9.9, 10.0, 10.1, 9.0, 11.4, 8.7, 9.6, 9.2, 9.7, 8.9, 9.2, 9.4, 9.7, 8.9, 9.3, 10.4, 11.9, 9.0, 12.0, 9.6, 9.2, 9.9, 9.0 (1) Is there significant evidence that the mean bonus percentage for males is larger than the mean bonus percentage for females? Use a a=0.05. (2) Estimate the difference in the mean bonus percentages for males and females using a 95% confidence interval. Male

想請問這兩題🥲 寫算式的那題有算出答案，但不確定這樣算是不是正確的？如果有誤想知道錯誤的地方，麻煩各位了

> lim n-xxx 5gn²₁²-n+5 ³√=7n² +Tun²³²_n+8 ·1.

第三題求解或者列式！

3. 某公司目前有$8,000萬的閒置資金,三年後才會需要使用。根 據財務部門所提供的資料,現在有四個投資方案列入考慮。各投資 方案均已評估過風險,並給予0至3分的風險指標,數值越大代表 風險越高。表2顯示各投資方案每年利息的百分比及風險指標。例 如,方案2完全沒有風險(風險指標為零),每年年底可獲得投資金 額 3%的利息;方案 4的風險最高(風險指標為2),投資後僅在第

請問這個要怎麼做啊 完全沒有頭緒

Preparing a Bank Reconciliation 2nd pe 002. IZTO The records of Derma Corporation show the following bank statement information for December Bank balance, December 31, 2022, $87,450 b. Service charges for December, $50 C. Rent collected by bank, $1,000 d. Note receivable collected by bank (including $300 interest), $2,300 f. e. December check returned marked NSF (check was a payment of an account receivable), $200 Bank erroneously reduced Derma's account for a check written by Dunna Company, $1,000 g. Cash account balance, December 31, 2022, $81,200 h. Outstanding checks, $9,200 i. Deposits in transit, $5,000 1. Prepare a bank reconciliation for December. 2. Prepare the entry to correct the cash account as of December 31, 2022.

如何判別？

7:40~ (A) 己 (B) 戊 (C) 庚 題組 甲於九十五年七月一日前涉嫌連續搶 奪乙丙經檢察官提起公訴,第一審審 判中復搶奪丁王,第二審審判中另搶 奪戊,第二審判決翌日又搶奪己,第 三審上訴中再搶奪庚,判決確定後旋 又搶奪辛; 過期 14. 檢察官對甲所犯何部分搶奪不得再行起 訴? (D) 辛 無年度 - 102年 測驗練習3#10290 B IILT 940 撰寫回應 II 4G 0 item #426103 難度:困難 統計: A(101) B(475) C(98) D(251) E (0) ●●●

想問3-9的a跟c

Problems 3-1. Explain the difference between *(a) random and systematic error. (b) constant and proportional error. *(c) absolute and relative error. (d) mean and median. *3-2. Suggest two sources of systematic error and two sources of random error in measuring the length of a 3-m table with a 1-m metal rule. 3-3. Name three types of systematic errors. *3-4. Describe at least three systematic errors that might occur while weighing a solid on an analytical balance. *3-5. Describe at least three ways in which a systematic error might occur while using a pipet to transfer a known volume of liquid. 3-6. Describe how systematic method errors may be detected. *3-7. What kind of systematic errors are detected by varying the sample size? 3-8. A method of analysis yields masses of gold that are low by 0.4 mg. Calculate the percent relative error caused by this result if the mass of gold in the sample is (a) 500 mg. (b) 250 mg. V(c) 125 mg. (d) 60 mg. 3-9. The method described in Problem 3-8 is to be used for the analysis of ores that assay about 1.2% gold. What minimum sample mass should be taken if the relative érror resulting from a 0.4-mg loss is not to exceed *(a) -0.1%? (b) -0.4%? (c) -0.8%? (d) - 1.1%? 3-10. The color change of a chemical indicator requires an overtitration of 0.03 mL. Calculate the error if the total volume of titrant is percent relative (a) 50.00 mL. (c) 25.0 mL. 3-11. A loss of 0.4 mg of Zn occurs in the course of an percent relative analysis for that element. Calculate the error due to this loss if the mass of Zn in the sample is *(b) 10.0 mL. (d) 30.0 mL. 190 (c) 188 (d) 4.52 x 103 4.63 x 103 4.53 x 10 ³ √6 *(a) 30 mg. (b) 100 mg. *(c) 300 mg. (d) 500 mg. 3-12. Find the mean and median of each of the following sets of data. Determine the deviation from the mean for each data point within the sets, and find the mean devi- Vation for each set. Use a spreadsheet if it is convenient. *(a) 0.0110 0.0105 (b) 24.53 0.0104 24.68 24.81 24.77 39.61 862 (f) 850 MA 3-13. Challenge Problem: Richards and W the molar mass of lithium and colle data. 24.73 Experiment 1 2 3 4 5 6 194 447 X 10 7 448 X 107 4.58 X 10 (a) Find the mean molar t workers. (b) Find the median molar ma (c) Assuming that the cam molar mass of lithium is the absolute ertor and of the mean value demi Willard. (d) Find in the chemical ues for the molar mus since 1910, and ag a table or spreadshera 1817 given in the a Richards and Willd. Com mass versus year to la of lithium has chang Suggest possible abruptly about 18 ant de (e) The incredibly deals Richards and W that major changes will occur. Disc calculation in pat (f) What factors ha since 1910? (g) How would you mass? 6See Chapter 2 of Applications of Microsoft Excel in Analytical Chemistry, 4th ed., for information about statistical 7T. W. Richards and H. H. Willard, J. Am. Chem. Soc., 1910, 32, 4, DOI: 10.1021/ja01919a002. built-in statistical functions. "Answers are provided at the end of the book for questions and problems marked with an asterisk The I of ₂ or inc rce of able vas error c often in individu ate resul data in rtainties. dimensio andom e analysts The result